ISSUE 1533: Fix --config argument description (#1534)

Change --config argument description to "Read configuration from FILE."
The "--config FILE                   Read configuration from FILE path"

README.md

@@ -143,7 +143,7 @@ Options:
                                   --exclude=.
 
   --version                       Show the version and exit.
-  --config FILE                   Read configuration from PATH.
+  --config FILE                   Read configuration from FILE path.
   -h, --help                      Show this message and exit.
 ```
 

src/black/__init__.py

@@ -471,7 +471,7 @@ def target_version_option_callback(
     ),
     is_eager=True,
     callback=read_pyproject_toml,
-    help="Read configuration from PATH.",
+    help="Read configuration from FILE path.",
 )
 @click.pass_context
 def main(