patch 8.2.2914: cannot paste a block without adding padding

Problem:    Cannot paste a block without adding padding.
Solution:   Add "zp" and "zP" which paste without adding padding. (Christian
            Brabandt, closes #8289)
diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index 545adff..118bc22 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -864,6 +864,8 @@
 |zm|		zm		   subtract one from 'foldlevel'
 |zn|		zn		   reset 'foldenable'
 |zo|		zo		   open fold
+|zp|		zp		   paste in block-mode without trailing spaces
+|zP|		zP		   paste in block-mode without trailing spaces
 |zr|		zr		   add one to 'foldlevel'
 |zs|		zs		   when 'wrap' off scroll horizontally to
 				   position the cursor at the start (left