repository: add information about the DM doc master branch changes (#879

)

.github/pull_request_template.md

@@ -12,7 +12,8 @@
 
 <!-- You **must** choose the DM version(s) that your changes apply to. Fill in "x" in [] to tick the checkbox below.-->
 
-- [ ] master (the latest development version)
+Since December 23, 2021, the TiDB DM documentation in the master branch has been merged to TiDB documentation by [#8042](https://github.com/pingcap/docs-cn/pull/8042) and [#7317](https://github.com/pingcap/docs/pull/7317). To create a PR for TiDB DM versions later than v5.3, either go to TiDB [English documentation repository](https://github.com/pingcap/docs) or [Chinese documentation repository](https://github.com/pingcap/docs-cn).
+
 - [ ] v5.3 (TiDB DM 5.3 versions)
 - [ ] v2.0 (TiDB DM 2.0 versions)
 - [ ] v1.0 (TiDB DM 1.0 versions)

CONTRIBUTING.md

@@ -29,21 +29,25 @@ Before you contribute, please take a quick look at some general information abou
 
 ### Learn about docs versions
 
-Currently, we maintain three versions of TiDB Data Migration documentation, each with a separate branch:
+Currently, we maintain the following versions of TiDB Data Migration documentation, each with a separate branch:
 
 | Branch name | Version description |
 | :--- | :-- |
-| `master` | the latest development version |
+| `master` | **no updates are allowed since December 23, 2021** |
 | `release-5.3` | the latest 5.3 stable version |
 | `release-2.0` | the latest 2.0 stable version |
 | `release-1.0` | the latest 1.0 stable version |
 
+> **Note:**
+>
+> Since December 23, 2021, the TiDB DM documentation in the master branch has been merged to TiDB documentation by [#8042](https://github.com/pingcap/docs-cn/pull/8042) and [#7317](https://github.com/pingcap/docs/pull/7317). To create a PR for TiDB DM versions later than v5.3, either go to TiDB [English documentation repository](https://github.com/pingcap/docs) or [Chinese documentation repository](https://github.com/pingcap/docs-cn).
+
 ### Use cherry-pick labels
 
 - If your changes apply to only one docs version, just submit a PR to the corresponding version branch.
 
 - If your changes apply to multiple docs versions, you don't have to submit a PR to each branch. Instead, after you submit your PR, trigger the ti-chi-bot to submit a PR to other version branches by adding one or several of the following labels as needed. Once the current PR is merged, ti-chi-bot will start to work.
-    - `needs-cherry-pick-master` label: ti-chi-bot will submit a PR to the `master` branch.
+
     - `needs-cherry-pick-release-5.3` label: ti-chi-bot will submit a PR to the `release-5.3` branch.
     - `needs-cherry-pick-release-2.0` label: ti-chi-bot will submit a PR to the `release-2.0` branch.
     - `needs-cherry-pick-release-1.0` label: ti-chi-bot will submit a PR to the `release-1.0` branch.

README.md

@@ -20,15 +20,14 @@ Currently, we maintain the following versions for TiDB DM documentation, each wi
 
 | Branch name | Version description |
 | :--- | :-- |
-| `master` | the latest development version |
+| `master` | **no updates are allowed since December 23, 2021**  |
 | `release-5.3` | the latest 5.3 stable version |
 | `release-2.0` | the latest 2.0 stable version |
 | `release-1.0` | the latest 1.0 stable version |
 
 > **Note:**
 >
-> - Previously, we maintain the TiDB DM documentation in the [docs](https://github.com/pingcap/docs) and [docs-cn](https://github.com/pingcap/docs-cn) repository.
-> - Since March 31, 2020, all the DM documentation has been moved to this repository, and maintained based on versions in the branches above.
+> Since December 23, 2021, the TiDB DM documentation in the master branch has been merged to TiDB documentation by [#8042](https://github.com/pingcap/docs-cn/pull/8042) and [#7317](https://github.com/pingcap/docs/pull/7317). To create a PR for TiDB DM versions later than v5.3, either go to TiDB [English documentation repository](https://github.com/pingcap/docs) or [Chinese documentation repository](https://github.com/pingcap/docs-cn).
 
 ## Contributing