Normalize changelog

changelogs/application_service/newsfragments/2130.clarification

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+Clarify in the application service registration schema the `url: null` behaviour.

changelogs/application_service/newsfragments/2130.feature

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-Correct null value handling for the AS Registration's `url` property.

changelogs/client_server/newsfragments/2083.clarification

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-Clarify the format of third-party invites, including the fact that identity
+Clarify the format of third-party invites, including the fact that identity server public keys can be encoded using standard or URL-safe base64.
-server public keys can be encoded using standard or URL-safe base64.

changelogs/client_server/newsfragments/2125.new

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+Add `GET /_matrix/client/v1/room_summary/{roomIdOrAlias}`, as per [MSC3266](https://github.com/matrix-org/matrix-spec-proposals/pull/3266).

changelogs/client_server/newsfragments/2144.clarification

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-Fix typo: as->has.
+Fix various typos throughout the specification.

changelogs/server_server/newsfragments/2083.clarification

@@ -1,2 +1 @@
-Clarify the format of third-party invites, including the fact that identity
+Clarify the format of third-party invites, including the fact that identity server public keys can be encoded using standard or URL-safe base64.
-server public keys can be encoded using standard or URL-safe base64.