[AST][NFC] Fixes a comment typo

Also a test for commit access.

Author: mordante

clang/lib/AST/DeclCXX.cpp

@@ -413,7 +413,7 @@ CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
       data().HasIrrelevantDestructor = false;
 
     // C++11 [class.copy]p18:
-    //   The implicitly-declared copy assignment oeprator for a class X will
+    //   The implicitly-declared copy assignment operator for a class X will
     //   have the form 'X& X::operator=(const X&)' if each direct base class B
     //   of X has a copy assignment operator whose parameter is of type 'const
     //   B&', 'const volatile B&', or 'B' [...]