[analyzer] Fix grammar in comment.

By Adam Schnitzer!

llvm-svn: 179352
diff --git a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
index 29b4a63..fe12866 100644
--- a/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/DebugCheckers.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-//  This file defines a checkers that display debugging information.
+//  This file defines checkers that display debugging information.
 //
 //===----------------------------------------------------------------------===//