Fix spelling errors

Fixed with
codespell --ignore-words-list=hist,parm,sur --skip=./core/src/imgui,./core/src/json.hpp,./core/libcorrect,./core/src/spdlog,./misc_modules/discord_integration/discord-rpc,./misc_modules/discord_integration/discord-rpc/include/rapidjson,./source_modules/sddc_source/src/libsddc --write-changes

core/src/core.cpp

@@ -327,7 +327,7 @@ int sdrpp_main(int argc, char* argv[]) {
     int biRes = backend::init(resDir);
     if (biRes < 0) { return biRes; }
 
-    // Intialize SmGui in normal mode
+    // Initialize SmGui in normal mode
     SmGui::init(false);
 
     if (!style::loadFonts(resDir)) { return -1; }