[Bulk] Validation: validation fixes JM 5/27a

[jmart1428]

This PR fixes 30 missing descriptions.

[opbld30]

Docs Build status updates of commit 7d27158:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
dynamics-nav/ISEMPTY-Function--RecordRef-.md	:white_check_mark:Succeeded
dynamics-nav/ISEXPANDED-Function--TestPage-.md	:white_check_mark:Succeeded
dynamics-nav/ISFILE-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISFILTERPAGEBUILDER-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISINSTREAM-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISINTEGER-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISNULLGUID-Function--GUID-.md	:white_check_mark:Succeeded
dynamics-nav/ISOPTION-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISOUTSTREAM-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISRECORD-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISTEMPORARY-Function--Record-.md	:white_check_mark:Succeeded
dynamics-nav/ISTEMPORARY-Function--RecordRef-.md	:white_check_mark:Succeeded
dynamics-nav/ISTEXT-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISTEXTCONSTANT-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISTIME-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ISTRANSACTIONTYPE-Function--Variant-.md	:white_check_mark:Succeeded
dynamics-nav/ITEM-Function--MediaSet-.md	:white_check_mark:Succeeded
dynamics-nav/IsUpdated-Operation.md	:white_check_mark:Succeeded
dynamics-nav/KEYCOUNT-Function--RecordRef-.md	:white_check_mark:Succeeded
dynamics-nav/KEYINDEX-Function--RecordRef-.md	:white_check_mark:Succeeded
dynamics-nav/Key-Properties.md	:white_check_mark:Succeeded
dynamics-nav/Key-Property.md	:white_check_mark:Succeeded
dynamics-nav/Key-Virtual-Table.md	:white_check_mark:Succeeded
dynamics-nav/LAST-Function--TestPage-.md	:white_check_mark:Succeeded
dynamics-nav/LEN-Function--File-.md	:white_check_mark:Succeeded

This comment lists only the first 25 files in the pull request. 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.

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[jmart1428]

Global effort to fix build validation errors The Content & Learning team is fixing build validation errors on docs.microsoft.com for the rest of H2. This will eliminate potential accessibility, security, and usability issues. This PR includes only build validation fixes and does not change other content. Please review within five business days and merge or comment in the PR with any changes you'd like to see. Thank you!

@buck1ey Can you please suggest a reviewer for this PR? Thank you.