Wording cleanups.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49091 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/scan-build b/utils/scan-build
index 01e3099..5600b05 100755
--- a/utils/scan-build
+++ b/utils/scan-build
@@ -186,9 +186,9 @@
   -?, -h        - Display this message.
   --help
   
-  -k            - Add "keep on going option" to the specified build command.
+  -k            - Add a "keep on going" option to the specified build command.
   --keep-going    This command currently supports make and xcodebuild.
-                  This is a helper option; one can specify the arguments
+                  This is a convenience option; one can specify this behavior
                   directly as build options.
 
   -v            - Verbose output from $Prog and the analyzer.