Set CMake code block language to txt as a fallback

Author: Rageking8

docs/build/cmake-presets-vs.md

@@ -443,7 +443,7 @@ Instead, enable and disable AddressSanitizer by setting the required compiler an
 
 You can add the following sample to *`CMakeLists.txt`* to enable or disable AddressSanitizer for a target:
 
-```cmd
+```txt
 option(ASAN_ENABLED "Build this target with AddressSanitizer" ON)
 
 if(ASAN_ENABLED)

docs/build/cmake-projects-in-visual-studio.md

@@ -148,7 +148,7 @@ When you build for Windows using the MSVC compiler, CMake projects have support
 
 When you build for Windows with the MSVC compiler, CMake projects have support for Edit and Continue. Add the following code to your *`CMakeLists.txt`* file to enable Edit and Continue.
 
-```
+```txt
 if(MSVC)
   target_compile_options(<target> PUBLIC "/ZI")
   target_link_options(<target> PUBLIC "/INCREMENTAL")