docs: update usage-examples.rst (soxoj#1996)

inital -> initial

Author: Ikko Eltociear Ashimine

docs/source/usage-examples.rst

@@ -5,7 +5,7 @@ Usage examples
 
 You can use Maigret as:
 
-- a command line tool: inital and a default mode
+- a command line tool: initial and a default mode
 - a `web interface <#web-interface>`_: view the graph with results and download all report formats on a single page
 - a library: integrate Maigret into your own project