docs: Fix ids of two proposals so they appear in sidebars

[voisey]

Summary

There are two proposals that have not been displayed in the docs for several releases due to a mismatch in the id in sidebars.json and that in the proposal doc itself. For the "Service Restriction Feature" proposal, I fix this by correcting the ids in the sidebar files, while for the "NMS Regression Testing" proposal, I correct the ids in the proposal docs according to the convention described here.

Test Plan

• I ran cd $MAGMA_ROOT/docs && make dev successfully locally
• I checked that for each of the modified versions, the two proposal pages now appear in the sidebar as expected

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[github-actions]

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[maxhbr]

LGTM