Mention that the diff from clang-format and -tidy can be applied (#2526)

Author: kripken

clang-format-diff.sh

@@ -19,7 +19,7 @@ MERGE_BASE=$(git merge-base $BRANCH HEAD)
 FORMAT_MSG=$(git clang-format $MERGE_BASE -q --diff -- src/)
 if [ -n "$FORMAT_MSG" -a "$FORMAT_MSG" != "no modified files to format" ]
 then
-  echo "Run git clang-format before committing!"
+  echo "Please run git clang-format before committing, or apply this diff:"
   echo
   # Run git clang-format again, this time without capruting stdout.  This way
   # clang-format format the message nicely and add color.

clang-tidy-diff.sh

@@ -20,7 +20,7 @@ CLANG_TIDY_DIFF=$CLANG_DIR/share/clang/clang-tidy-diff.py
 TIDY_MSG=$(git diff -U0 $BRANCH... | $CLANG_TIDY_DIFF -quiet -p1 2> /dev/null)
 if [ -n "$TIDY_MSG" -a "$TIDY_MSG" != "No relevant changes found." ]
 then
-  echo "Fix clang-tidy errors before committing!"
+  echo "Please run clang-tidy before committing, or apply this diff:"
   echo
   # Run clang-tidy once again to show the error
   git diff -U0 $BRANCH... | $CLANG_TIDY_DIFF -quiet -p1 2> /dev/null