org-colview: Improve docstring

* lisp/org-colview.el (org-dblock-write:columnview): Improve docstring.

lisp/org-colview.el

@@ -1390,24 +1390,54 @@ an inline src-block."
 ;;;###autoload
 (defun org-dblock-write:columnview (params)
   "Write the column view table.
+
 PARAMS is a property list of parameters:
 
-:id       the :ID: property of the entry where the columns view
-	  should be built.  When the symbol `local', call locally.
-	  When `global' call column view with the cursor at the beginning
-	  of the buffer (usually this means that the whole buffer switches
-	  to column view).  When \"file:path/to/file.org\", invoke column
-	  view at the start of that file.  Otherwise, the ID is located
-	  using `org-id-find'.
-:hlines   When t, insert a hline before each item.  When a number, insert
-	  a hline before each level <= that number.
-:indent   When non-nil, indent each ITEM field according to its level.
-:vlines   When t, make each column a colgroup to enforce vertical lines.
-:maxlevel When set to a number, don't capture headlines below this level.
-:match    When set to a string, use this as a tags/property match filter.
-:skip-empty-rows
-	  When t, skip rows where all specifiers other than ITEM are empty.
-:format   When non-nil, specify the column view format to use."
+`:id' (mandatory)
+
+    The ID property of the entry where the columns view should be
+    built.  When the symbol `local', call locally.  When `global'
+    call column view with the cursor at the beginning of the
+    buffer (usually this means that the whole buffer switches to
+    column view).  When \"file:path/to/file.org\", invoke column
+    view at the start of that file.  Otherwise, the ID is located
+    using `org-id-find'.
+
+`:exclude-tags'
+
+    List of tags to exclude from column view table.
+
+`:format'
+
+    When non-nil, specify the column view format to use.
+
+`:hlines'
+
+    When non-nil, insert a hline before each item.  When
+    a number, insert a hline before each level inferior or equal
+    to that number.
+
+`:indent'
+
+    When non-nil, indent each ITEM field according to its level.
+
+`:match'
+
+    When set to a string, use this as a tags/property match filter.
+
+`:maxlevel'
+
+    When set to a number, don't capture headlines below this level.
+
+`:skip-empty-rows'
+
+    When non-nil, skip rows where all specifiers other than ITEM
+    are empty.
+
+`:vlines'
+
+    When non-nil, make each column a column group to enforce
+    vertical lines."
   (let ((table
 	 (let ((id (plist-get params :id))
 	       view-file view-pos)