style: improve comments

vimrc

@@ -206,22 +206,30 @@ set foldlevel=1
 set backup
 set undofile
 
-" 21 command line editing	{{{2
+" 21 - command line editing	{{{2
 
 set wildignore+=*.o
 
-" 23 quickfix	{{{2
+" 23 - quickfix	{{{2
 
-" See https://phelipetls.github.io/posts/extending-vim-with-ripgrep/
+" External grep
+"
+" Tutorial: https://phelipetls.github.io/posts/extending-vim-with-ripgrep/
+"
 if executable("rg")
-  " Quickfix Unimpaired: [q ]q
+  set grepprg=rg\ --vimgrep
+  set grepformat=%f:%l:%c:%m
+
+  " Quickfix
   " :gr[ep]
   " :grepa[dd]
 
-  " Location Unimpaired: [l ]l
+  " Location
   " :lgr[ep][!]
-  set grepprg=rg\ --vimgrep
-  set grepformat=%f:%l:%c:%m
+
+  " Unimpaired shortcuts:
+  " [^Q ]^Q [Q ]Q [q ]q (file/first/previous)
+  " Same with L
 endif
 
 " 26 - various	{{{2
@@ -232,6 +240,8 @@ set gdefault    " use the 'g' flag for ":substitute"
 """ Key Mapping	{{{1
 """""""""""""""""""""""
 
+" To test whether a mapping is already used: try the command with no {rhs}
+
 " See :map-special-keys, :map-special-chars & <Char>
 
 " To see all mappings into a buffer:
@@ -241,6 +251,7 @@ set gdefault    " use the 'g' flag for ":substitute"
 ""
 
 let mapleader="²"
+" Use with <leader>
 
 nmap ( [
 nmap ) ]
@@ -598,8 +609,8 @@ autocmd FileType cpp setlocal comments^=:/// foldmethod=syntax foldlevel=0
 ""
 "" Find, substitute, and abbreviate several variations of a word at once.
 
-" abolish-coercion
-" camelCase MixedCase _snake_case UPPERCASE -dash-case dot.case space Title
+" :help abolish-coercion
+
 
 "" ALE		{{{2
 ""