Add version history to inspect and install report docs

Author: sbidoul

docs/html/reference/inspect-report.md

@@ -3,6 +3,10 @@
 ```{versionadded} 22.2
 ```
 
+```{versionchanged} 23.0
+``version`` has been bumped to ``1`` and the format declared stable.
+```
+
 The `pip inspect` command produces a detailed JSON report of the Python
 environment, including installed distributions.
 

docs/html/reference/installation-report.md

@@ -3,6 +3,10 @@
 ```{versionadded} 22.2
 ```
 
+```{versionchanged} 23.0
+``version`` has been bumped to ``1`` and the format declared stable.
+```
+
 The `--report` option of the pip install command produces a detailed JSON report of what
 it did install (or what it would have installed, if used with the `--dry-run` option).