Fixed link to upgrade instructions

CHANGELOG

@@ -14,7 +14,7 @@ This changelog is viewable on the web at https://docs.funkwhale.audio/changelog.
 ----------------
 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 
 Dropped python 3.5 support [manual action required, non-docker only]
@@ -158,7 +158,7 @@ Contributors to this release (translation, development, documentation, reviews,
 -------------------
 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 Enhancements:
 
@@ -190,7 +190,7 @@ Contributors to this release (development, documentation, reviews):
 -------------------
 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 
 Features:
@@ -566,7 +566,7 @@ Contributors to this release (translation, development, documentation, reviews,
 -------------------
 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 
 Denormalized audio permission logic in a separate table to enhance performance
@@ -631,7 +631,7 @@ Contributors to this release (translation, development, documentation, reviews,
 -----------------
 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 
 Support for genres via tags
@@ -956,7 +956,7 @@ Contributors to this release (translation, development, documentation, reviews,
 -------------------
 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 Enhancements:
 

changes/template.rst

 
 Upgrade instructions are available at
-https://docs.funkwhale.audio/index.html
+https://docs.funkwhale.audio/admin/upgrading.html
 
 {% for section, _ in sections.items() %}
 {% if sections[section] %}