Remove global infix in dotspacemacs-global-line-numbers

I feel that it is not needed because it makes not a lot of sense to
have it non global since it is a dotfile variable.

Also remove ' from the docstring for consistency.

core/core-dotspacemacs.el

@@ -188,9 +188,9 @@ can be toggled through `toggle-transparency'.")
 overrides the default behavior of Emacs which recenters the point when
 it reaches the top or bottom of the screen.")
 
-(defvar dotspacemacs-global-line-numbers nil
+(defvar dotspacemacs-line-numbers nil
   "If non nil line numbers are turned on in all `prog-mode' and `text-mode'
-derivatives. If set to `'relative', also turns on relative line numbers.")
+derivatives. If set to `relative', also turns on relative line numbers.")
 
 (defvar dotspacemacs-persistent-server nil
   "If non nil advises quit functions to keep server open when quitting.")

core/templates/.spacemacs.template

@@ -169,9 +169,9 @@ values."
    ;; point when it reaches the top or bottom of the screen. (default t)
    dotspacemacs-smooth-scrolling t
    ;; If non nil line numbers are turned on in all `prog-mode' and `text-mode'
-   ;; derivatives. If set to `'relative', also turns on relative line numbers.
+   ;; derivatives. If set to `relative', also turns on relative line numbers.
    ;; (default nil)
-   dotspacemacs-global-line-numbers nil
+   dotspacemacs-line-numbers nil
    ;; If non-nil smartparens-strict-mode will be enabled in programming modes.
    ;; (default nil)
    dotspacemacs-smartparens-strict-mode nil

doc/DOCUMENTATION.org

@@ -941,17 +941,17 @@ and ~T~):
 
 **** Global line numbers
 Line numbers can be toggled on in all =prog-mode= and =text-mode= buffers by
-setting the =dotspacemacs-global-line-numbers= variable in your =~/.spacemacs=
+setting the =dotspacemacs-line-numbers= variable in your =~/.spacemacs=
 to something different than =nil=.
 
 #+BEGIN_SRC emacs-lisp
-(setq-default dotspacemacs-global-line-numbers t)
+(setq-default dotspacemacs-line-numbers t)
 #+END_SRC
 
 If it is set to =relative=, line numbers are show in a relative way:
 
 #+BEGIN_SRC emacs-lisp
-(setq-default dotspacemacs-global-line-numbers 'relative)
+(setq-default dotspacemacs-line-numbers 'relative)
 #+END_SRC
 
 *** Mouse usage

layers/+distribution/spacemacs-base/config.el

@@ -173,7 +173,7 @@ It runs `tabulated-list-revert-hook', then calls `tabulated-list-print'."
 (setq column-number-mode t)
 ;; Activate linum-mode in all prog-mode and text-mode buffers if the setting is
 ;; enabled.
-(when dotspacemacs-global-line-numbers
+(when dotspacemacs-line-numbers
   (add-hook 'prog-mode-hook 'linum-mode)
   (add-hook 'text-mode-hook 'linum-mode))
 ;; line number

layers/+distribution/spacemacs/packages.el

@@ -1462,7 +1462,7 @@ It will toggle the overlay under point or create an overlay of one character."
     :commands (linum-relative-toggle linum-relative-on)
     :init
     (progn
-      (when (eq dotspacemacs-global-line-numbers 'relative)
+      (when (eq dotspacemacs-line-numbers 'relative)
         (linum-relative-on))
       (evil-leader/set-key "tr" 'linum-relative-toggle))
     :config