Add text to ContextWording docs encouraging configuration

Context descriptions are written in freeform human language, so it is
impossible to foresee all acceptable cases. Add text to the
documentation encouraging users to configure the list of permitted
prefixes to meet their needs.

on-behalf-of: @Cofense <[email protected]>

Author: elebow

lib/rubocop/cop/rspec/context_wording.rb

@@ -5,7 +5,11 @@ module Cop
     module RSpec
       # Checks that `context` docstring starts with an allowed prefix.
       #
-      # @see https://github.com/reachlocal/rspec-style-guide#context-descriptions
+      # The default list of prefixes is minimal. Users are encouraged to tailor
+      # the configuration to meet project needs. Other acceptable prefixes may
+      # include `if`, `unless`, `for`, `before`, `after`, or `during`.
+      #
+      # @see https://rspec.rubystyle.guide/#context-descriptions
       # @see http://www.betterspecs.org/#contexts
       #
       # @example `Prefixes` configuration

manual/cops_rspec.md

@@ -275,6 +275,10 @@ Enabled | No
 
 Checks that `context` docstring starts with an allowed prefix.
 
+The default list of prefixes is minimal. Users are encouraged to tailor
+the configuration to meet project needs. Other acceptable prefixes may
+include `if`, `unless`, `for`, `before`, `after`, or `during`.
+
 ### Examples
 
 #### `Prefixes` configuration