remove back references from sample Python regex

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3393 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

doc/nanorc.sample

@@ -291,7 +291,7 @@
 # syntax "python" "\.py$"
 # icolor brightblue "def [A-Z_0-9]+"
 # color brightcyan "\<(and|assert|break|class|continue|def|del|elif|else|except|exec|finally|for|from|global|if|import|in|is|lambda|map|not|or|pass|print|raise|return|try|while)\>"
-# color brightgreen "(["']).*[^\\]\1" "(["']){3}.*[^\\]\1"
+# color brightgreen "["'].*[^\\]["']" "["']{3}.*[^\\]["']{3}"
 # color brightgreen start=""""[^"]" end=""""" start="'''[^']" end="'''"
 # color brightred "#.*$"