update comments in SConstruct

SConstruct

@@ -6,20 +6,27 @@ from pathlib import Path
 # TODO: Do not copy environment after godot-cpp/test is updated <https://github.com/godotengine/godot-cpp/blob/master/test/SConstruct>.
 env = SConscript("godot-cpp/SConstruct")
 
+# Add source files.
 env.Append(CPPPATH=["src/"])
 sources = Glob("src/*.cpp")
 
-# Find correct addons path even if the directory or extension is renamed.
+# Find gdextension path even if the directory or extension is renamed.
+# Example: project/addons/example/example.gdextension
 (extension_path,) = glob("project/addons/*/*.gdextension")
 
+# Find the addon path (e.g. project/addons/example).
 addon_path = Path(extension_path).parent
+
+# Find the extension name from the gdextension file (e.g. example).
 extension_name = Path(extension_path).stem
 
-scons_cache_path = os.environ.get("SCONS_CACHE")
+# TODO: Cache is disabled currently.
-if scons_cache_path != None:
+# scons_cache_path = os.environ.get("SCONS_CACHE")
-    CacheDir(scons_cache_path)
+# if scons_cache_path != None:
-    print("Scons cache enabled... (path: '" + scons_cache_path + "')")
+#     CacheDir(scons_cache_path)
+#     print("Scons cache enabled... (path: '" + scons_cache_path + "')")
 
+# Create the library target (e.g. libexample.linux.debug.x86_64.so).
 if env["platform"] == "osx":
     library = env.SharedLibrary(
         "{}/bin/lib{}.{}.{}.framework/{1}.{2}.{3}".format(