Address mwichmann's feedback. Annotate with changed version and remove now obsolete note about function prototype

Author: bdbaddog

SCons/Conftest.py

@@ -244,6 +244,9 @@ def CheckFunc(context, function_name, header = None, language = None, funcargs =
     Note that this uses the current value of compiler and linker flags, make
     sure $CFLAGS, $CPPFLAGS and $LIBS are set correctly.
     Returns an empty string for success, an error message for failure.
+
+    .. versionchanged:: 4.7.0
+       The ``funcargs`` parameter was added.
     """
 
     # Remarks from autoconf:

doc/man/scons.xml

@@ -3974,32 +3974,27 @@ If omitted, the default stanza will be
 (with <parameter>function_name</parameter> appropriately substituted):
 </para>
 
-    <para>
-      The optional <parameter>funcargs</parameter> can be defined to specify an argument list for the generated
-      function invocation.
-    </para>
-
 <programlisting language="C">
 #ifdef __cplusplus
 extern "C"
 #endif
 char function_name(void);
 </programlisting>
 
+<para>
+      The optional <parameter>funcargs</parameter> can be defined to specify an argument list for the generated
+      function invocation.
+</para>
+
 <para>
 Note: if <parameter>header</parameter> is supplied,
-it should <emphasis>not</emphasis>
-include the standard header file that declares
-<parameter>function_name</parameter>,
-and it <emphasis>should</emphasis> include a
-dummy prototype similar to the default case.
-Compilers reject builds where a function call does
-not match the declared prototype as happens
-if the "real" header is included,
-and modern compilers are now rejecting
-implicit function declarations.
+  and the function_name being called takes any parameters, appropriate values for those
+  function arguments should be supplied
+  by using the <parameter>funcargs</parameter>.
 </para>
 
+<emphasis>Changed in version 4.7.0: added the <parameter>funcargs</parameter>.</emphasis>
+
 <para>Returns a boolean indicating success or failure.</para>
   </listitem>
   </varlistentry>