docs: Add comment and doc new variables

Author: jcs090218

docs/content/Development-API/_index.en.md

@@ -48,7 +48,23 @@ Return non-nil if the terminal supports colors.
 Eask's home directory path.
 
 ```elisp
-(message "%s" eask-homedir)
+(message "%s" eask-homedir)  ; ~/.eask/
+```
+
+## 🔍 Variable: eask-userdir
+
+Eask's user directory path.
+
+```elisp
+(message "%s" eask-userdir)  ; ~/
+```
+
+## 🔍 Variable: eask-package-sys-dir
+
+Eask global elpa directory; it will be treated as the system-wide packages.
+
+```elisp
+(message "%s" eask-package-sys-dir)  ; ~/.eask/30.1/elpa/
 ```
 
 ## 🔍 Variable: eask-invocation

docs/content/Development-API/_index.zh-tw.md

@@ -50,6 +50,22 @@ Eask 的主目錄路徑。
 (message "%s" eask-homedir)
 ```
 
+## 🔍 Variable: eask-userdir
+
+Eask 的使用者目錄路徑。
+
+```elisp
+(message "%s" eask-userdir)  ; ~/
+```
+
+## 🔍 Variable: eask-package-sys-dir
+
+Eask 全局 elpa 目錄；它將被視為系統全域的套件。
+
+```elisp
+(message "%s" eask-package-sys-dir)  ; ~/.eask/30.1/elpa/
+```
+
 ## 🔍 變數: eask-invocation
 
 Eask的呼叫程式路徑。

lisp/_prepare.el

@@ -85,18 +85,18 @@ Arguments FNC and ARGS are used for advice `:around'."
 (defconst eask-homedir (getenv "EASK_HOMEDIR")
   "Eask's home directory path.
 
-It points to the global home directory `/path/to/home/.eask/'.")
+It points to the global home directory `~/.eask/'.")
 
 (defconst eask-userdir (expand-file-name "../" eask-homedir)
   "Eask's user directory path.
 
-It points to the global user directory `/path/to/home/'.")
+It points to the global user directory `~/'.")
 
 (defconst eask-package-sys-dir (expand-file-name (concat emacs-version "/elpa/")
                                                  eask-homedir)
   "Eask global elpa directory; it will be treated as the system-wide packages.
 
-It points to the global elpa directory `/path/to/home/.eask/XX.X/elpa/'")
+It points to the global elpa directory `~/.eask/XX.X/elpa/'.")
 
 (defconst eask-invocation (getenv "EASK_INVOCATION")
   "Eask's invocation program path.")
@@ -692,7 +692,7 @@ Argument BODY are forms for execution."
   (declare (indent 1) (debug t))
   `(let ((package-archives package-archives)
          (archives (eask-listify ,archives))
-         (package-user-dir eask-package-sys-dir)  ; Point to the global directory.
+         (package-user-dir eask-package-sys-dir)  ; Install as global packages.
          (added))
      (dolist (archive archives)
        (unless (assoc archive package-archives)