Fix helm-resume key bindings conflict, now using <SPC> h l

for helm last buffer

DOCUMENTATION.md

@@ -1081,7 +1081,7 @@ Key Binding                           |                 Description
 <kbd>SPC /</kbd> or  <kbd>SPC a</kbd> | with [The Silver Searcher][ag]
 <kbd>SPC A</kbd>                      | with `ack`
 <kbd>SPC g</kbd>                      | with `grep`
-<kbd>SPC h r</kbd>                    | resume last helm popup
+<kbd>SPC h l</kbd>                    | show last helm popup
 
 ### Persistent highlighting
 

spacemacs/packages.el

@@ -1126,7 +1126,7 @@ determine the state to enable when escaping from the insert state.")
         "bs"  'helm-mini
         "sl"  'helm-semantic-or-imenu
         "hb"  'helm-bookmarks
-        "hr"  'helm-resume
+        "hl"  'helm-resume
         "ry"  'helm-show-kill-ring
         "rr"  'helm-register
         "rm"  'helm-all-mark-rings