[docs] : clean up cross_compiles.md

Change-Id: I88cf97ae0580f897c55ecd31d7f247e309598ec9
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/5461
Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>

docs/cross_compiles.md

diff --git a/docs/cross_compiles.md b/docs/cross_compiles.md
index 6da6654..01de456 100644
--- a/docs/cross_compiles.md
+++ b/docs/cross_compiles.md
@@ -13,7 +13,7 @@
 where the code will actually run (This is different from
 [autotools](http://www.gnu.org/software/automake/manual/html_node/Cross_002dCompilation.html)'
 terminology, but uses the more common terminology for cross
-compiling**).**
+compiling).
 
 (Confusingly, GN also refers to each build artifact -- an executable,
 library, etc. -- as a target. On this page, we will use "target" only to