Fix escape sequence in docstring regex (#1404)

Author: jjlawren

plexapi/base.py

@@ -253,7 +253,7 @@ def fetchItems(
 
                     fetchItem(ekey, viewCount__gte=0)
                     fetchItem(ekey, Media__container__in=["mp4", "mkv"])
-                    fetchItem(ekey, guid__regex=r"com\\.plexapp\\.agents\\.(imdb|themoviedb)://|tt\d+")
+                    fetchItem(ekey, guid__regex=r"com\\.plexapp\\.agents\\.(imdb|themoviedb)://|tt\\d+")
                     fetchItem(ekey, guid__id__regex=r"(imdb|tmdb|tvdb)://")
                     fetchItem(ekey, Media__Part__file__startswith="D:\\Movies")