[bot] Release v0.51.2

RELEASE

@@ -1,6 +1,6 @@
 # Generated by `make release` command.
 # DO NOT EDIT.
-tag: v0.51.1
+tag: v0.51.2
 
 releaseNoteGenerator:
   showCommitter: false

docs/content/en/docs-v0.51.x/quickstart/_index.md

@@ -53,7 +53,7 @@ Next, in order to perform CD tasks, you need to install a Piped agent to the clu
 
 From your logged in tab, navigate to the PipeCD setting page at [http://localhost:8080/settings/piped?project=quickstart](http://localhost:8080/settings/piped?project=quickstart).
 
-You will find the `+ADD` button around the top left of this page, click there and insert information to register a `piped` named `dev`.
+You will find the `+ADD` button around the top left of this page, click there and insert information to register the Piped agent (for example, `dev`).
 
 ![](/images/quickstart-adding-piped.png)
 

docs/content/en/docs-v0.51.x/user-guide/configuration-reference.md

@@ -209,7 +209,7 @@ One of `yamlField` or `regex` is required.
 |-|-|-|-|
 | file | string | The relative path from the repository root to the file to be updated. | Yes |
 | yamlField | string | The yaml path to the field to be updated. It requires to start with `$` which represents the root element. e.g. `$.foo.bar[0].baz`. | No |
-| regex | string | The regex string that specify what should be replaced. The only first capturing group enclosed by `()` will be replaced with the new value. e.g. `host.xz/foo/bar:(v[0-9].[0-9].[0-9])` | No |
+| regex | string | The regex string that specify what should be replaced. The only first capturing group enclosed by `()` will be replaced with the new value. e.g. `host.xz/foo/bar:(v[0-9].[0-9].[0-9])`, `host.xz/foo/bar:([0-9a-z]+)` | No |
 
 ## CommitMatcher