Update addCustomView.md

[ericregnier]

Corrected the notes about invalid GUIDs

[JimDaly]

Since the change directly changes the meaning of the current description. Need feature team to approve.

[JimDaly]

@adrianorth Can you approve this change?

[JimDaly]

@miglisic & @chmoncay

Change to addCustomView (Client API reference) directly contradicts current documentation saying it doesn't work.

Current:

This value is never saved and only needs to be unique among the other available views for the lookup. A string for a non-valid GUID will work, for example “00000000-0000-0000-0000-000000000001”. It’s recommended that you use a tool like guidgen.exe to generate a valid GUID.

Proposed:

This value is never saved and only needs to be unique among the other available views for the lookup on the current form. A string for a non-valid GUID will not work, for example “00000000-0000-0000-0000-000000000001” will not work. It’s recommended that you use a tool like guidgen.exe to generate a valid GUID.

[opbld32]

Docs Build status updates of commit cca03bf:

✅ Validation status: passed

File	Status	Preview URL	Details
powerapps-docs/developer/model-driven-apps/clientapi/reference/controls/addCustomView.md	✅Succeeded

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