Sema error: talk about discarding instead of suppressing

Maybe I'm just being pedantic here (most likely) but I don't like how we're
just telling the user here how to "suppress this error" by "assigning the value to '_'".
I think it's better if we use the word "discard" here which I think is
the official terminology and also tells the user what it actually means
to "assign the value to '_'".

Also, using the value would also be a way to "suppress the error".
It is just one of the two options: discard or use.

src/Sema.zig

@@ -3571,7 +3571,7 @@ fn ensureResultUsed(
                 const msg = try sema.errMsg(block, src, "value of type '{}' ignored", .{ty.fmt(sema.mod)});
                 errdefer msg.destroy(sema.gpa);
                 try sema.errNote(block, src, msg, "all non-void values must be used", .{});
-                try sema.errNote(block, src, msg, "this error can be suppressed by assigning the value to '_'", .{});
+                try sema.errNote(block, src, msg, "to discard the value, assign it to '_'", .{});
                 break :msg msg;
             };
             return sema.failWithOwnedErrorMsg(block, msg);

test/cases/compile_errors/for_loop_body_expression_ignored.zig

@@ -23,13 +23,13 @@ export fn f4() void {
 //
 // :5:30: error: value of type 'usize' ignored
 // :5:30: note: all non-void values must be used
-// :5:30: note: this error can be suppressed by assigning the value to '_'
+// :5:30: note: to discard the value, assign it to '_'
 // :9:30: error: value of type 'usize' ignored
 // :9:30: note: all non-void values must be used
-// :9:30: note: this error can be suppressed by assigning the value to '_'
+// :9:30: note: to discard the value, assign it to '_'
 // :13:31: error: value of type 'bool' ignored
 // :13:31: note: all non-void values must be used
-// :13:31: note: this error can be suppressed by assigning the value to '_'
+// :13:31: note: to discard the value, assign it to '_'
 // :16:42: error: value of type 'usize' ignored
 // :16:42: note: all non-void values must be used
-// :16:42: note: this error can be suppressed by assigning the value to '_'
+// :16:42: note: to discard the value, assign it to '_'

test/cases/compile_errors/generic_instantiation_failure.zig

@@ -24,4 +24,4 @@ pub export fn entry() void {
 //
 // :18:43: error: value of type 'type' ignored
 // :18:43: note: all non-void values must be used
-// :18:43: note: this error can be suppressed by assigning the value to '_'
+// :18:43: note: to discard the value, assign it to '_'

test/cases/compile_errors/ignored_assert-err-ok_return_value.zig

@@ -11,4 +11,4 @@ fn bar() anyerror!i32 {
 //
 // :2:11: error: value of type 'i32' ignored
 // :2:11: note: all non-void values must be used
-// :2:11: note: this error can be suppressed by assigning the value to '_'
+// :2:11: note: to discard the value, assign it to '_'

test/cases/compile_errors/ignored_comptime_statement_value.zig

@@ -10,4 +10,4 @@ export fn foo() void {
 //
 // :3:9: error: value of type 'comptime_int' ignored
 // :3:9: note: all non-void values must be used
-// :3:9: note: this error can be suppressed by assigning the value to '_'
+// :3:9: note: to discard the value, assign it to '_'

test/cases/compile_errors/ignored_comptime_value.zig

@@ -14,7 +14,7 @@ fn bar() u8 {
 //
 // :2:5: error: value of type 'comptime_int' ignored
 // :2:5: note: all non-void values must be used
-// :2:5: note: this error can be suppressed by assigning the value to '_'
+// :2:5: note: to discard the value, assign it to '_'
 // :5:5: error: value of type 'u8' ignored
 // :5:5: note: all non-void values must be used
-// :5:5: note: this error can be suppressed by assigning the value to '_'
+// :5:5: note: to discard the value, assign it to '_'

test/cases/compile_errors/ignored_deferred_statement_value.zig

@@ -10,4 +10,4 @@ export fn foo() void {
 //
 // :3:9: error: value of type 'comptime_int' ignored
 // :3:9: note: all non-void values must be used
-// :3:9: note: this error can be suppressed by assigning the value to '_'
+// :3:9: note: to discard the value, assign it to '_'

test/cases/compile_errors/ignored_return_value.zig

@@ -11,4 +11,4 @@ fn bar() i32 {
 //
 // :2:8: error: value of type 'i32' ignored
 // :2:8: note: all non-void values must be used
-// :2:8: note: this error can be suppressed by assigning the value to '_'
+// :2:8: note: to discard the value, assign it to '_'

test/cases/compile_errors/ignored_statement_value.zig

@@ -8,4 +8,4 @@ export fn foo() void {
 //
 // :2:5: error: value of type 'comptime_int' ignored
 // :2:5: note: all non-void values must be used
-// :2:5: note: this error can be suppressed by assigning the value to '_'
+// :2:5: note: to discard the value, assign it to '_'

test/cases/compile_errors/while_loop_body_expression_ignored.zig

@@ -32,16 +32,16 @@ export fn f5() void {
 //
 // :5:25: error: value of type 'usize' ignored
 // :5:25: note: all non-void values must be used
-// :5:25: note: this error can be suppressed by assigning the value to '_'
+// :5:25: note: to discard the value, assign it to '_'
 // :10:26: error: value of type 'usize' ignored
 // :10:26: note: all non-void values must be used
-// :10:26: note: this error can be suppressed by assigning the value to '_'
+// :10:26: note: to discard the value, assign it to '_'
 // :15:26: error: value of type 'usize' ignored
 // :15:26: note: all non-void values must be used
-// :15:26: note: this error can be suppressed by assigning the value to '_'
+// :15:26: note: to discard the value, assign it to '_'
 // :20:23: error: value of type 'bool' ignored
 // :20:23: note: all non-void values must be used
-// :20:23: note: this error can be suppressed by assigning the value to '_'
+// :20:23: note: to discard the value, assign it to '_'
 // :25:34: error: value of type 'usize' ignored
 // :25:34: note: all non-void values must be used
-// :25:34: note: this error can be suppressed by assigning the value to '_'
+// :25:34: note: to discard the value, assign it to '_'