Fix link to Former Governance document in introduction (#661)

Author: fredericsimard

docs/en/community/governance/gtfs-schedule-governance/introduction.md

@@ -3,9 +3,9 @@
 !!! warning "**Governance Framework Transition**"
 
     **As of July 7, 2025**, all new Pull Requests are subject to the **new GTFS Schedule Governance Framework** outlined in this section.
-    <br>- Pull Requests opened **before July 7, 2025** will continue to follow the **[Former Governance](CHANGES.md)**.
+    <br>- Pull Requests opened **before July 7, 2025** will continue to follow the **[Former Governance](changes.md)**.
     <br>- This includes the following PRs: [567](https://github.com/google/transit/pull/567), [561](https://github.com/google/transit/pull/561), [556](https://github.com/google/transit/pull/556), [546](https://github.com/google/transit/pull/546), [545](https://github.com/google/transit/pull/545), [533](https://github.com/google/transit/pull/533), [515](https://github.com/google/transit/pull/515), [502](https://github.com/google/transit/pull/502), [498](https://github.com/google/transit/pull/498), [483](https://github.com/google/transit/pull/483), [423](https://github.com/google/transit/pull/423).
-    <br>- Once all PRs opened prior to July 7, 2025 are resolved, the **[Former Governance](CHANGES.md)** will be fully deprecated.
+    <br>- Once all PRs opened prior to July 7, 2025 are resolved, the **[Former Governance](changes.md)** will be fully deprecated.
 
 !!! note
 
@@ -51,4 +51,4 @@ As mentioned above, different [types of changes](change-types.md) follow differe
 | Adoption                    | The approved change is officially added to the GTFS specification by the Maintainer.                         | —               | The Maintainer updates the official documentation                                                  |
 
 
-There are shortened processes for [Non-Functional changes](change-types.md/#non-functional-changes) and [Documentation Maintenance](change-types.md/#documentation-maintenance). For more details, see the full [Change Process](change-process.md).
+There are shortened processes for [Non-Functional changes](change-types.md/#non-functional-changes) and [Documentation Maintenance](change-types.md/#documentation-maintenance). For more details, see the full [Change Process](change-process.md).