A few fixes to comments and docstrings

contrib/lisp/org-element.el

@@ -1462,9 +1462,9 @@ CONTENTS is nil."
 
 Return a list whose CAR is `src-block' and CDR is a plist
 containing `:language', `:switches', `:parameters', `:begin',
-`:end', `:hiddenp', `:contents-begin', `:contents-end',
-`:number-lines', `:retain-labels', `:use-labels', `:label-fmt',
-`:preserve-indent', `:value' and `:post-blank' keywords.
+`:end', `:hiddenp', `:number-lines', `:retain-labels',
+`:use-labels', `:label-fmt', `:preserve-indent', `:value' and
+`:post-blank' keywords.
 
 Assume point is at the beginning of the block."
   (save-excursion

contrib/lisp/org-export.el

@@ -70,7 +70,7 @@
 ;;
 ;;    In addition to element and object types, one function can be
 ;;    associated to the `template' symbol and another one to the
-;;    `plain-list' symbol.  The former returns the final transcoded
+;;    `plain-text' symbol.  The former returns the final transcoded
 ;;    string, and can be used to add a preamble and a postamble to
 ;;    document's body.  It must accept two arguments: the transcoded
 ;;    string and the property list containing export options.  The