Move :tools fly{check,spell} to :checkers {syntax,spell}

These modules were renamed so we can later generalize their
implementations, such as adding flymake support to the syntax checker.

init.example.el

@@ -77,7 +77,9 @@
        ;;vterm             ; another terminals in Emacs
 
        :checkers
-       ;;grammar
+       syntax              ; tasing you for every semicolon you forget
+       ;;spell             ; tasing you for misspelling mispelling
+       ;;grammar           ; tasing grammar mistake every you make
 
        :tools
        ;;ansible
@@ -87,8 +89,6 @@
        ;;editorconfig      ; let someone else argue about tabs vs spaces
        ;;ein               ; tame Jupyter notebooks with emacs
        (eval +overlay)     ; run code, run (also, repls)
-       flycheck          ; tasing you for every semicolon you forget
-       ;;flyspell          ; tasing you for misspelling mispelling
        ;;gist              ; interacting with github gists
        (lookup           ; helps you navigate your code and documentation
         +docsets)        ; ...or in Dash docsets locally