Update inheritance section in config-labels docs
Update inheritance section in config-labels docs

Substitute label function "MaxWithBlock" with "NoBlock" when removing a
label in a child project. Function "MaxWithBlock" was deprecated with
change I2faf081c and it's now disallowed to set it as a value. This was
done in favour of submit requirements.

Release-Notes: skip
Change-Id: Ieaf585c4a095c74865195970361afd1efda4f315

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