docs: fix typo unneccessary -> unnecessary

Signed-off-by: Vaibhav Srivastava <vaibhavsri1712@gmail.com>

Author: Vaibhav Srivastava

pcsx2/CMakeLists.txt

@@ -1274,7 +1274,7 @@ function(setup_main_executable target)
 		if("${file}" MATCHES "^\\.") # Don't copy macOS garbage (mainly Finder's .DS_Store files) into application
 			continue()
 		endif()
-		if (NOT WIN32 AND "${path}" MATCHES "/dx11/") # Don't include unneccessary stuff
+		if (NOT WIN32 AND "${path}" MATCHES "/dx11/") # Don't include unnecessary stuff
 			continue()
 		endif()
 		if (NOT BUNDLE_EMOJI_FONT AND "${path}" MATCHES "fonts/Twemoji")