fix: fixed experimental.system-git-client reported as unknown setting

docs/configuration.md

@@ -157,6 +157,20 @@ Defaults to one of the following directories:
 - Windows: `C:\Users\<username>\AppData\Local\pypoetry\Cache`
 - Unix:    `~/.cache/pypoetry`
 
+### `experimental.system-git-client`
+
+**Type**: boolean
+
+*Introduced in 1.2.0*
+
+Use system git client backend for git related tasks.
+
+Poetry uses `dulwich` by default for git related tasks to not rely on the availability of a git client.
+
+If you encounter any problems with it, set to `true` to use the system git backend.
+
+Defaults to `false`.
+
 ### `installer.parallel`
 
 **Type**: boolean

src/poetry/console/commands/config.py

@@ -96,6 +96,11 @@ def unique_config_values(self) -> dict[str, tuple[Any, Any, Any]]:
                 boolean_normalizer,
                 True,
             ),
+            "experimental.system-git-client": (
+                boolean_validator,
+                boolean_normalizer,
+                False,
+            ),
             "installer.parallel": (
                 boolean_validator,
                 boolean_normalizer,