Fix some checkdoc warnings in customization settings

Inspired by https://github.com/alphapapa/ement.el/issues/32#issuecomment-902539093.

init.el

@@ -358,6 +358,7 @@
              db/scratch
              db/find-user-init-file
              db/run-or-hide-ansi-term
+             db/ement-connect
              db/hex-to-ascii
              db/text-to-hex
              turn-on-lispy-when-available

site-lisp/db-customize.el

@@ -9,7 +9,7 @@
 
 
 (defgroup personal-settings nil
-  "A bunch of functions and variables for personalizing emacs."
+  "A bunch of functions and variables for personalizing Emacs."
   :prefix "db/"
   :group 'convenience
   :group 'help
@@ -20,19 +20,31 @@
   :group 'personal-settings
   :type 'string)
 
+(defcustom db/matrix-user-id ""
+  "Main Matrix User ID."
+  :group 'personal-settings
+  :type 'string)
+
+(defcustom db/matrix-password-store-entry ""
+  "Password Store entry for Matrix User ID in `db/matrix-user-id'."
+  :group 'personal-settings
+  :type 'string)
+
 (defcustom db/important-documents-path "~/Documents/library/"
-  "Path to look for documents that can be listed in extended
-search commands like `db/helm-shortcuts’."
+  "Path to look for important documents.
+
+These documents can then be listed in extended search commands
+like `db/helm-shortcuts’."
   :group 'personal-settings
   :type 'string)
 
 (defcustom db/path-to-onenote "c:/Program Files (x86)/Microsoft Office/Office15/ONENOTE.EXE"
-  "Path to OneNote executable, for opening corresponding org-mode links."
+  "Path to OneNote executable, for opening corresponding Org mode links."
   :group 'personal-settings
   :type 'file)
 
 (defcustom db/path-to-outlook "c:/Program Files (x86)/Microsoft Office/Office15/OUTLOOK.EXE"
-  "Path to Outlook executable, for opening corresponding org-mode links."
+  "Path to Outlook executable, for opening corresponding Org mode links."
   :group 'personal-settings
   :type 'file)
 
@@ -53,7 +65,8 @@ are assumed to be of the form *.crt."
   :set #'db/update-cert-file-directory)
 
 (defcustom db/rfc-cache-path nil
-  "Path where RFC documents are automatically downloaded to when opening rfc: links.
+  "Path where documents are automatically downloaded to when opening rfc: links.
+
 If this path is not set, i.e., is null, no automatic download will happen."
   :group 'personal-settings
   :type '(choice (const nil) file))

site-lisp/db-utils.el

@@ -105,6 +105,16 @@ With ARG, switch to `default-directory' of the current buffer first."
         (insert (format "cd '%s'" current-dir))
         (comint-send-input)))))
 
+(defun db/ement-connect ()
+  "Connect to my matrix account."
+  (interactive)
+  (require 'ement)
+  (let ((password (password-store-get db/matrix-password-store-entry)))
+    (unless password
+      (user-error "No pass entry for Matrix password at “%s”" db/matrix-password-store-entry))
+    (ement-connect :user-id db/matrix-user-id
+                   :password password)))
+
 
 ;;; General Utilities