Fix a typo in GN documentation

tools/gn/docs/reference.md

Index: tools/gn/docs/reference.md
diff --git a/tools/gn/docs/reference.md b/tools/gn/docs/reference.md
index 26ba5c6eb5363d4a794987050aa7147296110473..b62abbd162bddbf51f56f14061f1f9009e272edf 100644
--- a/tools/gn/docs/reference.md
+++ b/tools/gn/docs/reference.md
@@ -6584,7 +6584,7 @@
       build.gn file.
         "//foo/bar/baz.txt" => "obj/foo/bar"
 
-  {{source_target_relative}}\n"
+  {{source_target_relative}}
       The path to the source file relative to the target's directory. This will
       generally be used for replicating the source directory layout in the
       output directory. This can only be used in actions and it is an error to