fix double entry in doc

doc/vimagit.txt

@@ -339,13 +339,6 @@ section only.
             NOTE: this function is extremely powerful, just give it a try!
 
 
-                                    *vimagit-<C-n>*          *magit#jump_hunk()*
-                                    *vimagit-<C-p>*
-                                    *vimagit-g:magit_jump_next_hunk*
-                                    *vimagit-g:magit_jump_prev_hunk*
-  <C-n>,<C-p>  Move to Next or Previous hunk.
-
-
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