doc: document the %use fp macro package

Documentation for %use fp was missing...

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/doc/changes.src b/doc/changes.src
index f0ca314..0cb5f27 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -7,6 +7,7 @@
 The NASM 2 series support x86-64, and is the production version of NASM
 since 2007.
 
+
 \S{cl-2.09} Version 2.09
 
 \b Fixed assignment the magnitude of \c{%rep} counter. It is limited
@@ -68,6 +69,9 @@
   can now contain non-identifier characters if surrounded by quotes.
   See \k{getenv}.
 
+\b Add a new standard macro package \c{%use fp} for floating-point
+  convenience macros.  See \k{pkg_fp}.
+
 
 \S{cl-2.08.02} Version 2.08.02