Fix python -m docs dev time convenience command

docs/__main__.py

@@ -1,7 +1,9 @@
 import platform
 
-from pygame.docs.serve import main as serve
-from pygame.docs.static import main as static
+# use relative import here and not absolute, so that `python -m docs` works at
+# development time
+from .serve import main as serve
+from .static import main as static
 
 
 def main():

docs/serve.py

@@ -4,7 +4,9 @@
 import webbrowser
 from http.server import ThreadingHTTPServer, SimpleHTTPRequestHandler
 
-from pygame.docs import PKG_DIR, has_local_docs
+# use relative import here and not absolute, so that `python -m docs` works at
+# development time
+from . import PKG_DIR, has_local_docs
 
 
 class DocsHandler(SimpleHTTPRequestHandler):

docs/static.py

@@ -1,6 +1,8 @@
 import webbrowser
 
-from pygame.docs import PKG_DIR
+# use relative import here and not absolute, so that `python -m docs` works at
+# development time
+from . import PKG_DIR
 
 
 def open_docs():