Update library tracking issue for libs-api rename.

Author: m-ou-se

.github/ISSUE_TEMPLATE/library_tracking_issue.md

@@ -2,7 +2,7 @@
 name: Library Tracking Issue
 about: A tracking issue for an unstable library feature.
 title: Tracking Issue for XXX
-labels: C-tracking-issue, T-libs
+labels: C-tracking-issue, T-libs-api
 ---
 <!--
 Thank you for creating a tracking issue!
@@ -60,7 +60,7 @@ unresolved questions left, the feature might be ready for stabilization.
 If this feature didn't go through the RFC process, a final commenting period
 (FCP) is always needed before stabilization. This works as follows:
 
-A library team member can kick off the stabilization process, at which point
+A library API team member can kick off the stabilization process, at which point
 the rfcbot will ask all the team members to verify they agree with
 stabilization. Once enough members agree and there are no concerns, the final
 commenting period begins: this issue will be marked as such and will be listed