docs: less confusing sentence for running `gclient sync` command

docs/ios_build_instructions.md

 # iOS Build Instructions
 
 **Note:** Upstreaming of iOS code is still a work in progress. In particular,
 note that **it is not currently possible to build an actual Chromium app.**
 Currently, the buildable binaries are ios\_web\_shell (a minimal wrapper around
 the web layer), and various unit tests.
 
 ## Prerequisites
 
 *   A Mac with a version of OS X capable of running the latest version
@@ skipping 74 matching lines @@
 
 To run in the simulator from the command line, you can use `iossim`. For
 example, to run a debug build of ios\_web\_shell:
 
 ```shell
 out/Debug-iphonesimulator/iossim out/Debug-iphonesimulator/ios_web_shell.app
 ```
 
 ## Converting an existing Mac checkout into an iOS checkout
 
-If you want to convert your Mac checkout into an iOS checkout, you can
-follow those steps:
+If you want to convert your Mac checkout into an iOS checkout, follow the steps
+below:
 
 1. Add `target_os = [ "ios" ]` to the bottom of your `chromium/.gclient`

[sdefresne, 2016/03/04 18:09:51]

nit: like bulleted list, this need to be indented like this:

1.  Add `target_os = [ "ios" ]` to the bottom of your `chromium/.gclient`
    file.

1.  Make sure you have the following in your `chromium/chromium.gyp_env`
    file (removing the `chromium_ios_signing=0` if you want to make
    developer-signed builds):

[tfarina, 2016/03/04 18:47:57]

Ah, that is very true. Thanks for noticing. Both are recommeded by the style
guide. Fixed.

 file.
 
 2. Make sure you have the following in your `chromium/chromium.gyp_env`
 file (removing the `chromium_ios_signing=0` if you want to make
 developer-signed builds):
 
 ```json
 {
   "GYP_DEFINES" : "OS=ios chromium_ios_signing=0",
   "GYP_GENERATORS" : "ninja,xcode-ninja",
 }
 ```
 
-Then make sure you sync again to get all the new files like the following. At
-the end it will run `build/gyp_chromium` which will regenerate all the build
-files according to the new settings.
+3. Make sure to sync again to fetch the iOS specific dependencies and
+regenerate build rules using:
 
 ```shell
 gclient sync
 ```
 
 ## Troubleshooting
 
 If your build fails, check the iOS columns of [the Mac
-waterfall](http://build.chromium.org/p/chromium.mac/console) (the last
-two) to see if the bots are green. In general they should be, since
-failures on those bots will close the tree.
+waterfall](http://build.chromium.org/p/chromium.mac/console) (the last two) to
+see if the bots are green. In general they should be, since failures on those
+bots will close the tree.