updating tangle-mode documentation for new reading

doc/org.texi

@@ -15078,12 +15078,12 @@ permissions of the tangled file are set to make it executable.
 The @code{tangle-mode} header argument controls the permission set on tangled
 files.  The value of this header argument will be passed to
 @code{set-file-modes}.  For example, to set a tangled file as read only use
-@code{:tangle-mode #o444}, or to set a tangled file as executable use
-@code{:tangle-mode #o755}.  Blocks with @code{shebang} (@ref{shebang}) header
-arguments will automatically be made executable unless the @code{tangle-mode}
-header argument is also used.  The behavior is undefined if multiple code
-blocks with different values for the @code{tangle-mode} header argument are
-tangled to the same file.
+@code{:tangle-mode (identity #o444)}, or to set a tangled file as executable
+use @code{:tangle-mode (identity #o755)}.  Blocks with @code{shebang}
+(@ref{shebang}) header arguments will automatically be made executable unless
+the @code{tangle-mode} header argument is also used.  The behavior is
+undefined if multiple code blocks with different values for the
+@code{tangle-mode} header argument are tangled to the same file.
 
 @node eval, wrap, tangle-mode, Specific header arguments
 @subsubsection @code{:eval}