Fix warnings, mainly about missing docstrings

tekuti.el

@@ -74,7 +74,7 @@ with a ‘/’.")
     (`("COMMENTS" ,status)
      (if (string= status "on")
          pair
-       (error "Unknown value for comments: %s; Can only be ‘on’ or not present."
+       (error "Unknown value for comments: %s; Can only be ‘on’ or absent"
               status)))
     (_ pair)))
 
@@ -105,9 +105,11 @@ with a ‘/’.")
              defaults))))
 
 (defun tekuti-form-encode-pair (key value)
+  "Make sure KEY and VALUE are properly form-encoded."
   (concat (url-hexify-string key) "=" (url-hexify-string value)))
 
 (defun tekuti-form-encode-data (data)
+  "Convert DATA from an alist to a form-encoded string."
   (mapconcat
    (lambda (pair)
      (tekuti-form-encode-pair (downcase (car pair)) (cadr pair)))
@@ -115,6 +117,12 @@ with a ‘/’.")
    "&"))
 
 (defun tekuti--send-finished (status buffer args updatep)
+  "Callback for when the request to tekuti finishes.
+STATUS is the full data structure sent on by ‘url-retrieve’.
+BUFFER is the buffer that was published. ARGS is a list
+containing the data that was collected from the buffer to make
+the request. UPDATEP is a boolean indicating whether a post was
+updated or created."
   (pcase-exhaustive status
     (`(:redirect ,url . ,_)
      (save-excursion
@@ -143,12 +151,16 @@ with a ‘/’.")
      (message "Failed to %s post: %d" (if updatep "update" "create") code))))
 
 (defun tekuti--get-update-url ()
+  "Try and get the value of the ‘UPDATE_URL’ property in the current buffer."
   (save-excursion
     (goto-char (point-min))
     (car (map-elt (org-collect-keywords '("UPDATE_URL")) "UPDATE_URL"))))
 
 ;;;###autoload
 (defun tekuti-send ()
+  "Export and send the current buffer to tekuti.
+The current buffer should be an ‘org-mode’ buffer that you wish
+to post to your tekuti blog."
   (interactive)
   (let* ((data (tekuti-build-data-from-org))
          (url-request-method "POST")