Fix typo

Author: LasseRosenow

docs/writing-reactors/actions.mdx

@@ -21,7 +21,7 @@ An action declaration has one of the following forms:
 ```
 
 The `min_delay`, `min_spacing`, and `policy` are all optional.
-If only one argument is given in parentheses, then it is interpreted as an `min_delay`,
+If only one argument is given in parentheses, then it is interpreted as a `min_delay`,
 if two are given, then they are interpreted as `min_delay` and `min_spacing`.
 The `min_delay` and `min_spacing` are time values.
 The `policy` argument is a string that can be one of the following: