Update lib/rubocop/rspec/language.rb

Co-authored-by: Benjamin Quorning <[email protected]>

Author: pirj

lib/rubocop/rspec/language.rb

@@ -177,7 +177,7 @@ def self.all(element)
       end
 
       # This is used in Dialect and DescribeClass cops to detect RSpec blocks.
-      # Ommission of Expectations and Runners is a deliberate simplification,
+      # Omission of Expectations and Runners is a deliberate simplification,
       # but not a requirement.
       module ALL # :nodoc:
         def self.all(element)