All activity md files except 51_actvity*.md in Rel 1.1: Wrong URL to activity ID

The URL prefix is the same in all Activity ID URLs: https://gitlab.ow2.org/ggi/ggi/-/blob/main/handbook/content/51_activity_, although it should also be 52_activity*, 53_activity*, etc.

Edited Dec 23, 2022 by Silvério Santos

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