Update README.

README.md

@@ -129,7 +129,7 @@ Fly Mode
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 Fly Mode will always force closed-pair jumping instead of inserting. only for ")", "}", "]"
 
-If jumps in mistake, could use AutoPairsBackInsert(Default Key: <M-b>) to jump back and insert closed pair.
+If jumps in mistake, could use AutoPairsBackInsert(Default Key: `<M-b>`) to jump back and insert closed pair.
 
 the most situation maybe want to insert single closed pair in the string, eg ")"
 
@@ -151,13 +151,13 @@ Shortcuts
         <M-p> : Toggle Autopairs (g:AutoPairsShortcutToggle)
         <M-e> : Fast Wrap (g:AutoPairsShortcutFastWrap)
         <M-n> : Jump to next closed pair (g:AutoPairsShortcutJump)
-        <M-b> : BackInsert
+        <M-b> : BackInsert (g:AutoPairsShortcutBackInsert)
 
     If <M-p> <M-e> or <M-n> conflict with another keys or want to bind to another keys, add
 
         let g:AutoPairShortcutToggle = '<another key>'
 
-    to .vimrc, it the key is empty string '', then the shortcut will be disabled.
+    to .vimrc, if the key is empty string '', then the shortcut will be disabled.
 
 Options
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