bug#32037: simplify possessive form's "functions' definitions"

[Van L <van@scratch.space>]

diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi
index be3e938b24..82c49bf693 100644
--- a/doc/lispintro/emacs-lisp-intro.texi
+++ b/doc/lispintro/emacs-lisp-intro.texi
@@ -3028,7 +3028,7 @@ Primitive Functions
 @cindex Primitives written in C
 All functions are defined in terms of other functions, except for a few
 @dfn{primitive} functions that are written in the C programming
-language.  When you write functions' definitions, you will write them in
+language.  When you write function definitions, you will write them in
 Emacs Lisp and use other functions as your building blocks.  Some of the
 functions you will use will themselves be written in Emacs Lisp (perhaps
 by you) and some will be primitives written in C@.  The primitive
@@ -3179,7 +3179,7 @@ defun
 
 @findex * @r{(multiplication)}
 The third line of the example consists of the body of the function
-definition.  (Most functions' definitions, of course, are longer than
+definition.  (Most function definitions, of course, are longer than
 this.)  In this function, the body is the list, @code{(* 7 number)}, which
 says to multiply the value of @var{number} by 7.  (In Emacs Lisp,
 @code{*} is the function for multiplication, just as @code{+} is the