Add git diff to lint messaging so it is more actionable (#4041)

Author: janeyx99

.circleci/config.yml

@@ -182,7 +182,9 @@ run_clang_format: &run_clang_format
     find -name '*.cpp' -o -name '*.h' | xargs clang-format-7 -i -style=file
     git_status=$(git status --porcelain)
     if [[ $git_status ]]; then
-      echo "clang-format-7 is not happy, please run \"clang-format-7 -i -style /PATH/TO/foo.cpp\" to the following files"
+      git diff
+      echo "clang-format-7 recommends the changes above, please manually apply them OR automatically apply the changes "
+      echo "by running \"clang-format-7 -i -style /PATH/TO/foo.cpp\" to the following files"
       echo "${git_status}"
       exit 1
     else
@@ -207,7 +209,9 @@ run_yapf: &run_yapf
     yapf -i -r *.py test/ scripts/ torch_xla/
     git_status=$(git status --porcelain)
     if [[ $git_status ]]; then
-      echo "yapf is not happy, please run `yapf -i /PATH/TO/foo.py` to the following files"
+      git diff
+      echo "yapf recommends the changes above, please manually apply them OR automatically apply the changes "
+      echo "by running `yapf -i /PATH/TO/foo.py` to the following files"
       echo "${git_status}"
       exit 1
     else