improve code and description of nested tmux solution

README.md

@@ -273,39 +273,36 @@ bind -r C-l run "tmux select-pane -R"
 bind -r C-\ run "tmux select-pane -l"
 ```
 
-Another potential solution is to manually prevent the outermost
-tmux session from intercepting the navigation keystrokes by
-disabling the prefix table:
+Another potential solution is to manually prevent the outermost tmux session
+from intercepting the navigation keystrokes by disabling the prefix table:
 
 ```
 set -g pane-active-border-style 'fg=#000000,bg=#ffff00'
 bind -T root F12  \
-  set prefix None \;\     # optional; disables prefix key
+  set prefix None \;\
   set key-table off \;\
   if -F '#{pane_in_mode}' 'send-keys -X cancel' \;\
   set -g pane-active-border-style 'fg=#000000,bg=#00ff00'
   refresh-client -S \;\
 
 bind -T off F12 \
-  set -u prefix \;\       # only needed if prefix key is disabled
+  set -u prefix \;\
   set -u key-table \;\
   set -g pane-active-border-style 'fg=#000000,bg=#ffff00'
   refresh-client -S
 ```
 
-This code, added to the machine running the outermost tmux
-session, toggles the outermost prefix table on and off with the
-`F12` key. When off, the active pane's border changes to green to
-indicate that the inner session receives navigation keystrokes.
-When toggled back on, the border returns to yellow and normal
-operation resumes and he outermost with respond to the nav
-keystrokes.
-
-The code example above also toggles the prefix key (ctrl-b by default)
-for the outer session so that same prefix can be temporarily used
-on the inner session instead of having to use a different
-prefix (ctrl-a by default) which you may find convenient. But if this
-is not to your liking, just remove the lines indicated as optional.
+This code, added to the machine running the outermost tmux session, toggles the
+outermost prefix table on and off with the `F12` key. When off, the active
+pane's border changes to green to indicate that the inner session receives
+navigation keystrokes. When toggled back on, the border returns to yellow and
+normal operation resumes and the outermost responds to the nav keystrokes.
+
+The code example above also toggles the prefix key (ctrl-b by default) for the
+outer session so that same prefix can be temporarily used on the inner session
+instead of having to use a different prefix (ctrl-a by default) which you may
+find convenient. If not, simply remove the lines that set/unset the prefix key
+from the code example above.
 
 
 Troubleshooting