textops: more details for set_body_multipart() and need of msg_apply_changes()

modules/textops/doc/textops_admin.xml

@@ -1396,13 +1396,22 @@ if (starts_with("$rU", "+358"))
 		The core will take care of the last boundary ending "--". Detecting wich one is
 		the last and fixing the others if needed.
 		</para>
+		<para>
+		Note: it may be required that msg_apply_changes() from textops module
+		has to be executed if there are other operations over the new body.
+		</para>
 		<example>
 		<title><function>set_body_multipart</function> usage</title>
 		<programlisting format="linespecific">
 ...
 set_body_multipart("test", "text/plain", "delimiter");
+msg_apply_changes();
+append_body_part(...);
+
 ...
-Will produce:
+
+# Will produce:
+
 ...
 Content-Type: multipart/mixed;boundary="delimiter"
 Mime-Version: 1.0
@@ -1457,7 +1466,9 @@ text
 $var(b) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c"
 append_body_part("$var(b)", "application/vnd.cirpack.isdn-ext", "signal;handling=required");
 ...
-Will append this the body:
+
+# Will append this to the body:
+
 ...
 Content-Type: application/vnd.cirpack.isdn-ext
 Content-Disposition: signal;handling=required