typofixes by https://github.com/vlajos/misspell_fixer

[vlajos]

Please check if the PR fulfills these requirements

• [ I hope so.] The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• [ NA] Tests for the changes have been added (for bug fixes / features)
• [ NA] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ ] Feature
[ X] Code style update (formatting, local variables)
[ X] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)

Some typos in the code, mostly in documentation blocks.

What is the new behavior?

The typos had been fixed.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[X ] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

• I am a bit uncertain about the commit message format. Let me know please whether/how should I modify it...
• And generally I am not too familiar with the rules, let me know please if anything should have to be amended.

[vlajos]

(I have not known this pullapprove system. Let me know please if splitting/reorganising the PR would make the story smoother.)

[gkalpak]

I love this ❤️
Extra points if you found them by reading through all files 😛

[gkalpak]

Why not in-between?

[vlajos]

I think you are right. I reverted this one.

[gkalpak]

An approval from @IgorMinar or @mhevery would cover all necessary groups.
But there are also some conflicts to be resolved.

[vlajos]

I rebased a few times to fix the conflicts. Can I do anything else, to make the story slicker?

[wardbell]

I rebased for you and force pushed that commit into your PR. That took care of the merge conflicts.
I'm reviewing the changes next while Travis grinds away.

Requesting @IgorMinar approval

[wardbell]

Terrific! LGTM. Keep up the good work.

[wardbell]

Can't get this to pass CircleCI because it's trapped in v1.
Created new PR #17716 that contains this commit so you'll still be credited for your fine work.
That PR closes this one.

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