; Cleanup comments and doc strings in textconv.c

; Cleanup comments and doc strings in textconv.c

* src/textconv.c (copy_buffer_text): Rename from 'copy_buffer'.
All callers changed.
(textconv_query, complete_edit_check, commit_text)
(finish_composing_text, set_composing_region)
(textconv_set_point_and_mark, delete_surrounding_text)
(request_point_update, textconv_barrier, get_extracted_text)
(get_surrounding_text, report_point_change)
(report_selected_window_change): Fix commentary.
(Fset_text_conversion_style, text-conversion-edits)
(overriding-text-conversion-style, text-conversion-face): Doc fix.