Correct use of OSX to Mac OS X and properly format yasm providers on Mac OS X

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/platform.texi

@@ -45,20 +45,21 @@ bash ./configure
 @end example
 
 @anchor{Darwin}
-@section Darwin (OSX, iPhone)
+@section Darwin (Mac OS X, iPhone)
 
 The toolchain provided with Xcode is sufficient to build the basic
 unacelerated code.
 
-OSX on PowerPC or ARM (iPhone) requires a preprocessor from
+Mac OS X on PowerPC or ARM (iPhone) requires a preprocessor from
 @url{http://github.com/yuvi/gas-preprocessor} to build the optimized
 assembler functions. Just download the Perl script and put it somewhere
 in your PATH, FFmpeg's configure will pick it up automatically.
 
-OSX on amd64 and x86 requires @command{yasm} to build most of the
-optimized assembler functions @url{http://mxcl.github.com/homebrew/, Homebrew},
-@url{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix}
-or @url{http://www.macports.org, MacPorts} can easily provide it.
+Mac OS X on amd64 and x86 requires @command{yasm} to build most of the
+optimized assembler functions. @uref{http://www.finkproject.org/, Fink},
+@uref{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix},
+@uref{http://mxcl.github.com/homebrew/, Homebrew}
+or @uref{http://www.macports.org, MacPorts} can easily provide it.
 
 
 @chapter DOS