Fix minor spelling and grammar errors

Author: soulcutter

lib/rspec/core/example.rb

@@ -9,7 +9,7 @@ module Core
     #
     # This allows us to provide rich metadata about each individual
     # example without adding tons of methods directly to the ExampleGroup
-    # that users may inadvertantly redefine.
+    # that users may inadvertently redefine.
     #
     # Useful for configuring logging and/or taking some action based
     # on the state of an example's metadata.

spec/rspec/core/example_spec.rb

@@ -799,7 +799,7 @@ def expect_pending_result(example)
   end
 
   describe "exposing the examples reporter" do
-    it "returns a null reporter when the example hasnt run yet" do
+    it "returns a null reporter when the example has not run yet" do
       example = RSpec.describe.example
       expect(example.reporter).to be RSpec::Core::NullReporter
     end