Move ios documentation from //docs to //docs/ios.

docs/ios/build_instructions.md

Index: docs/ios/build_instructions.md
diff --git a/docs/ios_build_instructions.md b/docs/ios/build_instructions.md
similarity index 99%
copy from docs/ios_build_instructions.md
copy to docs/ios/build_instructions.md
index 2d7a013236fb380be9f9907591b3353efb457be4..1fb0988498f961b5c06f936f60d99209e5f8d788 100644
--- a/docs/ios_build_instructions.md
+++ b/docs/ios/build_instructions.md
@@ -1,7 +1,7 @@
 # Checking out and building Chromium for iOS
 
 There are instructions for other platforms linked from the
-[get the code](get_the_code.md) page.
+[get the code](../get_the_code.md) page.
 
 ## Instructions for Google Employees
 
@@ -102,7 +102,7 @@ file is updated (either by you or after rebasing). If you forget to run it,
 the list of targets and files in the Xcode solution may be stale.
 
 You can also follow the manual instructions on the
-[Mac page](mac_build_instructions.md), but make sure you set the
+[Mac page](../mac_build_instructions.md), but make sure you set the
 GN arg `target_os="ios"`.
 
 ## Building for device