Add a changelog for the appendices (#3609)

As a document which is versioned, we should have a changelog for it. It might be empty most of the time but oh well.

changelogs/appendices/newsfragments/.gitignore

@@ -0,0 +1 @@
+!.gitignore

changelogs/appendices/newsfragments/3171.feature

@@ -0,0 +1 @@
+Describe "Common Namespaced Identifier Grammar" as per [MSC2758](https://github.com/matrix-org/matrix-doc/pull/2758).

content/appendices.md

@@ -389,6 +389,8 @@ information.
 
 ### Common Namespaced Identifier Grammar
 
+{{% added-in v="1.2" %}}
+
 The specification defines some identifiers to use the *Common Namespaced
 Identifier Grammar*. This is a common grammar intended for non-user-visible
 identifiers, with a defined mechanism for implementations to create new

layouts/shortcodes/changelog/changelog-changes.html

@@ -37,6 +37,7 @@
 {{ partial "render-api-changes" (dict "title" "Identity Service API" "id" "identity-service-api" "path" (path.Join $path "identity_service")) }}
 {{ partial "render-api-changes" (dict "title" "Push Gateway API" "id" "push-gateway-api" "path" (path.Join $path "push_gateway")) }}
 {{ partial "render-api-changes" (dict "title" "Room Versions" "id" "room-versions" "path" (path.Join $path "room_versions")) }}
+{{ partial "render-api-changes" (dict "title" "Appendices" "id" "appendices" "path" (path.Join $path "appendices")) }}
 
 {{ define "partials/render-api-changes" }}
 <h3 id="{{.id}}">{{ .title }}</h3>

scripts/generate-changelog.sh

@@ -12,6 +12,7 @@ cd changelogs
 rm -f rendered.*
 
 # Reversed order so that room versions ends up on the bottom
+towncrier --name "Appendices" --dir "./appendices" --config "./pyproject.toml" --yes
 towncrier --name "Room Versions" --dir "./room_versions" --config "./pyproject.toml" --yes
 towncrier --name "Push Gateway API" --dir "./push_gateway" --config "./pyproject.toml" --yes
 towncrier --name "Identity Service API" --dir "./identity_service" --config "./pyproject.toml" --yes