Fix 'unknown documentation command' warning ranges

Warnings generated by -Wdocumentation-unknown-command did only have a
start location, not a full source range. This resulted in only the
"carret" being show in messages, and IDEs highlighting only the single
initial character.

llvm-svn: 285056
diff --git a/clang/lib/AST/CommentLexer.cpp b/clang/lib/AST/CommentLexer.cpp
index 57bfef0..65d0f56 100644
--- a/clang/lib/AST/CommentLexer.cpp
+++ b/clang/lib/AST/CommentLexer.cpp
@@ -378,15 +378,17 @@
           if ((Info = Traits.getTypoCorrectCommandInfo(CommandName))) {
             StringRef CorrectedName = Info->Name;
             SourceLocation Loc = getSourceLocation(BufferPtr);
-            SourceRange CommandRange(Loc.getLocWithOffset(1),
-                                     getSourceLocation(TokenPtr));
+            SourceLocation EndLoc = getSourceLocation(TokenPtr);
+            SourceRange FullRange = SourceRange(Loc, EndLoc);
+            SourceRange CommandRange(Loc.getLocWithOffset(1), EndLoc);
             Diag(Loc, diag::warn_correct_comment_command_name)
-              << CommandName << CorrectedName
+              << FullRange << CommandName << CorrectedName
               << FixItHint::CreateReplacement(CommandRange, CorrectedName);
           } else {
             formTokenWithChars(T, TokenPtr, tok::unknown_command);
             T.setUnknownCommandName(CommandName);
-            Diag(T.getLocation(), diag::warn_unknown_comment_command_name);
+            Diag(T.getLocation(), diag::warn_unknown_comment_command_name)
+                << SourceRange(T.getLocation(), T.getEndLocation());
             return;
           }
         }