docs: fix typo in http.md

[m-burst]

PR Checklist

Please check if your PR fulfills the following requirements:

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

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

There's a typo in the HttpClient docs.

Issue Number: N/A

What is the new behavior?

Typo fixed

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[kapunahelewong]

Good catch! Thank you for submitting this PR. Would you amend the commit message to be "docs: fix typo in http.md" and tag me when you've done it so I can approve? Thank you!

[m-burst]

@kapunahelewong Done :)

[kapunahelewong]

LGTM! Thank you, @m-burst !!

[IgorMinar]

@kapunahelewong please add the merge label in the future as well, otherwise the caretaker will not see the pr. thanks

[kapunahelewong]

Oh thank you, @IgorMinar! Now I understand and will be sure to do it in the future.

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