Reporting taxonomy value update: ms.service = functions -> azure-functions

[SeanMcCain-metadata]

Please see attached spreadsheet for azure-docs-sdk-java usage of the ms.service reporting taxonomy value functions, which should be removed and replaced with the ms.service reporting taxonomy value azure-functions
functions_to_azure-functions.xlsx

Please Assign to:

• Daniel Jurek (@danieljurek)

With the Label:

• Docs

[SeanMcCain-metadata]

Please Assign to:

• Daniel Jurek (@danieljurek)

With the Label:

• Docs