Merge pull request #18840 from ctiijima/typo_fixes
authorAmit Patankar <amitpatankar@google.com>
Mon, 30 Apr 2018 19:45:34 +0000 (12:45 -0700)
committerGitHub <noreply@github.com>
Mon, 30 Apr 2018 19:45:34 +0000 (12:45 -0700)
Fix typos in index.md


Trivial merge