Fix typo in method name

unsuccessfull -> unsuccessful

Author: camelid

Diff for: compiler/rustc_errors/src/diagnostic.rs

@@ -166,7 +166,7 @@ impl Diagnostic {
         self.note_expected_found_extra(expected_label, expected, found_label, found, &"", &"")
     }
 
-    pub fn note_unsuccessfull_coercion(
+    pub fn note_unsuccessful_coercion(
         &mut self,
         expected: DiagnosticStyledString,
         found: DiagnosticStyledString,

Diff for: compiler/rustc_errors/src/diagnostic_builder.rs

@@ -245,7 +245,7 @@ impl<'a> DiagnosticBuilder<'a> {
         found_extra: &dyn fmt::Display,
     ) -> &mut Self);
 
-    forward!(pub fn note_unsuccessfull_coercion(
+    forward!(pub fn note_unsuccessful_coercion(
         &mut self,
         expected: DiagnosticStyledString,
         found: DiagnosticStyledString,

Diff for: compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1622,7 +1622,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     }
                 }
                 (TypeError::ObjectUnsafeCoercion(_), _) => {
-                    diag.note_unsuccessfull_coercion(found, expected);
+                    diag.note_unsuccessful_coercion(found, expected);
                 }
                 (_, _) => {
                     debug!(