docs: remove duplicated sub title

kenjis · kenjis · commit 1d7f21c19f65 · 2023-09-08T09:33:31.000+09:00
diff --git a/user_guide_src/source/incoming/filters.rst b/user_guide_src/source/incoming/filters.rst
@@ -170,9 +170,6 @@ a list of URI path (relative to BaseURL) patterns that filter should apply to:
 
 .. _filters-filters-filter-arguments:
 
-Filter Arguments
-================
-
 Filter Arguments
 ----------------
 
