Fix some typos. (#1146)

README.md

@@ -192,7 +192,7 @@ target_link_libraries(foobar PRIVATE Microsoft.GSL::GSL)
 
 ### FetchContent
 
-If you are using CMake version 3.11+ you can use the offical [FetchContent module](https://cmake.org/cmake/help/latest/module/FetchContent.html).
+If you are using CMake version 3.11+ you can use the official [FetchContent module](https://cmake.org/cmake/help/latest/module/FetchContent.html).
 This allows you to easily incorporate GSL into your project.
 
 ```cmake

docs/headers.md

@@ -804,7 +804,7 @@ void operator=(const final_action&) = delete;
 void operator=(final_action&&)      = delete;
 ```
 
-Move construction is allowed. Copy construction is deleted. Copy and move assignment are also explicitely deleted.
+Move construction is allowed. Copy construction is deleted. Copy and move assignment are also explicitly deleted.
 
 #### <a name="H-util-finally" />Non-member functions
 ```cpp

tests/span_compatibility_tests.cpp

@@ -519,7 +519,7 @@ TEST(span_compatibility_tests, assertion_tests)
 
 // assertions for span's definition
 static_assert(std::is_same<decltype(gsl::dynamic_extent), const std::size_t>::value,
-              "gsl::dynamic_extent must be respresented as std::size_t");
+              "gsl::dynamic_extent must be represented as std::size_t");
 static_assert(gsl::dynamic_extent == static_cast<std::size_t>(-1),
               "gsl::dynamic_extent must be defined as the max value of std::size_t");