Update wg-lead-R&Rs.md

added Arnaud's suggested item

Signed-off-by: CRob <[email protected]>

process/wg-lead-R&Rs.md

@@ -5,5 +5,6 @@
 - Provide technical guidance and sponsorships for sub-projects, coordinate with related Projects and SIGs, and arbitrate technical disputes as needed
 - Present quarterly WG updates to the TAC and regularly make the work of the WG legible throughout OpenSSF (i.e. posted in community channels)
 - Facilitate WG voting as needed
+- Responsible for keeping the WG on track with regard to its mission and negotiating with the TAC any desired changes.
 - Accountable for GitHub Repo management including edits/updates, issue and PR backlog management, and delegating responsibility to a separate volunteer, if applicable
-- Time commitment: 2-3 hours per week
+- Time commitment: 2-3 hours per week