Fix matrix auth documentation

[hyderraza18]

This PR updates the matrix-auth plugin JCasC documentation to reflect the syntax changes introduced in matrix-auth 3.2+.
The previous examples used the deprecated pre-3.2 format.
I added an updated example using the new entries: structure and noted that the old format is deprecated but still works when deprecated: warn is enabled.

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[timja]

The documentation does use the 3.2+ format already???

[hyderraza18]

The documentation does use the 3.2+ format already???

The docs mention 3.2+, but the example shown is still using the older pre-3.2 syntax.
My change updates the example to the actual 3.2+ entries: format used by matrix-auth now, so the documentation matches the current schema.

[timja]

The documentation does use the 3.2+ format already???

The docs mention 3.2+, but the example shown is still using the older pre-3.2 syntax. My change updates the example to the actual 3.2+ entries: format used by matrix-auth now, so the documentation matches the current schema.

Your change only adds:

Note: Starting from matrix-auth 3.2, the older
grantedPermissions: JCasC syntax is deprecated.
The examples below already use the new entries: format, which should be used going forward.

You have a conflict with master probably got an old version locally?

[hyderraza18]

@timja Yes , i did not notice that. I will make the necessary changes