NFC: Enforce good formatting across multiple clang-tools-extra files

This patch improves readability of multiple files in clang-tools-extra
and enforces LLVM Coding Guidelines.

Reviewed by: ioeric

Differential Revision: https://reviews.llvm.org/D50707

llvm-svn: 339687
diff --git a/clang-tools-extra/clangd/Diagnostics.cpp b/clang-tools-extra/clangd/Diagnostics.cpp
index 3c293dd..c053bd2 100644
--- a/clang-tools-extra/clangd/Diagnostics.cpp
+++ b/clang-tools-extra/clangd/Diagnostics.cpp
@@ -1,11 +1,11 @@
-//===--- Diagnostics.cpp ----------------------------------------*- C++-*-===//
+//===--- Diagnostics.cpp -----------------------------------------*- C++-*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
-//===---------------------------------------------------------------------===//
+//===----------------------------------------------------------------------===//
 
 #include "Diagnostics.h"
 #include "Compiler.h"