Merge pull request ninja-build#1484 from smeenai/gyp-to-gn

Change gyp to gn

Author: jhasse

doc/manual.asciidoc

@@ -154,10 +154,10 @@ design is quite clever.
 Ninja's benefit comes from using it in conjunction with a smarter
 meta-build system.
 
-http://code.google.com/p/gyp/[gyp]:: The meta-build system used to
+https://gn.googlesource.com/gn/[gn]:: The meta-build system used to
 generate build files for Google Chrome and related projects (v8,
-node.js).  gyp can generate Ninja files for all platforms supported by
-Chrome. See the
+node.js), as well as Google Fuschia.  gn can generate Ninja files for
+all platforms supported by Chrome. See the
 https://chromium.googlesource.com/chromium/src/+/master/docs/ninja_build.md[Chromium Ninja documentation for more details].
 
 https://cmake.org/[CMake]:: A widely used meta-build system that