Fix syntax mistakes in two examples

docs/markdown/CMake-module.md

@@ -41,7 +41,7 @@ sub_proj = cmake.subproject('libsimple_cmake')
 # Fetch the dependency object
 cm_lib = sub_proj.dependency('cm_lib')
 
-executable(exe1, ['sources'], dependencies: [cm_lib])
+executable('exe1', ['sources'], dependencies: [cm_lib])
 ```
 
 The `subproject` method is almost identical to the normal Meson

docs/markdown/Release-notes-for-0.51.0.md

@@ -325,7 +325,7 @@ sub_proj = cmake.subproject('libsimple_cmake')
 # Fetch the dependency object
 cm_lib = sub_proj.dependency('cm_lib')
 
-executable(exe1, ['sources'], dependencies: [cm_lib])
+executable('exe1', ['sources'], dependencies: [cm_lib])
 ```
 
 It should be noted that not all projects are guaranteed to work. The