Fixed a grammar issue

Author: javiereguiluz

components/console/usage.rst

@@ -159,5 +159,5 @@ the possible commands to choose from will be output.
 
 .. versionadded:: 3.4
     Case-insensitivity of command shortcuts was introduced in Symfony 3.4. In
-    previous Symfony versions, shortcuts must match the case of the original
+    previous Symfony versions, shortcuts had to match the case of the original
     command name (e.g. ``d:g`` was not the same shortcut as ``D:G``).