Rewrote one awkward sentence. (#54892)

Rewrote awkward sentence in the developing inventory guide.

+label: docsite_pr

docs/docsite/rst/dev_guide/developing_inventory.rst

@@ -151,7 +151,7 @@ The base class does some minimal assignment for reuse in other methods.
         self.templar = Templar(loader=loader)
 
 It is up to the plugin now to deal with the inventory source provided and translate that into the Ansible inventory.
-To facilitate this there are a few of helper functions used in the example below:
+To facilitate this the example below uses a few helper functions:
 
 .. code-block:: python