Add working link to using odata with httpclient

[Sm1rfa]

Add link to the official MSFT documentation

[opbld30]

Docs Build status updates of commit 12dd90c:

:warning: Validation status: warnings

File	Status	Preview URL	Details
Odata-docs/client/using-extensions.md	:warning:Warning	View	Details

Odata-docs/client/using-extensions.md

• Line 172, Column 257: [Warning-hard-coded-locale] Link 'https://docs.microsoft.com/en-us/odata/client/using-httpclient' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.

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[opbld32]

Docs Build status updates of commit e166d24:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Odata-docs/client/using-extensions.md	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel