minor update of developer guide

developer-guide-en.org

@@ -111,11 +111,11 @@ Make sure your project is using git.
 
 All developer will encounter the problem to find file with similar file name. C++ developers need find "window.hpp" from "window.cpp". Javascript developers need find "Component.test.js" from "Component.js".
 
-The easiest solution is just sorting the candidates from =counsel-git= by string distance. See [[https://www.emacswiki.org/emacs/LevenshteinDistance][LevenshteinDistance]].
+The easiest solution is to sort the candidates from =counsel-git= by [[https://www.emacswiki.org/emacs/LevenshteinDistance][string distance]]. 
 
-There are tons of handy commands from these counsel/swiper/ivy (=counsel-imenu=, =counsel-recentf=, =counsel-ibuffer=, ...).
+There are tons of handy commands from counsel/swiper/ivy (=counsel-imenu=, =counsel-recentf=, =counsel-ibuffer=, ...).
 
-API =ivy-read= from =ivy= is useful. Here is a simple demo on how to use =ivy-read=,
+API =ivy-read= from =ivy= is very useful. Here is a simple demo on how to use =ivy-read=,
 
 #+begin_src elisp
 (require 'ivy)
@@ -125,7 +125,7 @@ API =ivy-read= from =ivy= is useful. Here is a simple demo on how to use =ivy-re
                     (message "I chose %s" choice)))
 #+end_src
 * Sub-windows
-I usually open 4~8 sub-windows and use [[https://github.com/deb0ch/emacs-winum][winum]] to move focus between sub-windows.
+I usually open 4 sub-windows and use [[https://github.com/deb0ch/emacs-winum][winum]] to move cursor between sub-windows.
 
 You need some package to save and load sub-windows layout. You can start from [[https://github.com/wasamasa/eyebrowse][eyebrowse]].
 * Execute command