Fix spelling mistakes in //docs.

docs/profiling_content_shell_on_android.md

 # Profiling Content Shell on Android
 
 Below are the instructions for setting up profiling for Content Shell on
 Android. This will let you generate profiles for ContentShell. This will require
 linux, building an userdebug Android build, and wiping the device.
 
 [TOC]
 
 ## Prepare your device.
 
 You need an Android 4.2+ device (Galaxy Nexus, Nexus 4, 7, 10, etc.) which you
 don’t mind erasing all data, rooting, and installing a userdebug build on.
 
 ## Get and build `content_shell_apk` for Android
 
 (These instructions have been carefully distilled from the
 [Android Build Instructions](android_build_instructions.md).)
 
 1.  Get the code! You’ll want a second checkout as this will be
-    android-specific. You know the drill:
+    Android-specific. You know the drill:
     https://www.chromium.org/developers/how-tos/get-the-code
 1.  Append this to your `.gclient` file: `target_os = ['android']`
 1.  Create `chromium.gyp_env` next to your `.gclient` file:
     `echo "{ 'GYP_DEFINES': 'OS=android', }" > chromium.gyp_env`
 1.  (Note: All these scripts assume you’re using "bash" (default) as your
     shell.)
 1.  Sync and runhooks (be careful not to run hooks on the first sync):
 
     ```
     gclient sync --nohooks
@@ skipping 74 matching lines @@
 automatically push binaries and pull the profile data for you.
 
     build/android/adb_profile_chrome --browser=content_shell --perf
 
 While you still have to build, install and launch the APK yourself, Catapult
 will take care of creating the symfs etc. (i.e. you can skip the "not needed for
 Telemetry" steps below).
 
 ## Install `/system/bin/perf` on your device (not needed for Telemetry)
 
-    # From inside the android source tree (not inside Chromium)
+    # From inside the Android source tree (not inside Chromium)
     mmm external/linux-tools-perf/
     adb remount # (allows you to write to the system image)
     adb sync
     adb shell perf top # check that perf can get samples (don’t expect symbols)
 
 ## Install ContentShell
 
 Install with the following:
 
     build/android/adb_install_apk.py \
@@ skipping 79 matching lines @@
 
     ```
     adb pull /proc/kallsyms symbols/kallsyms
     ```
 
 1.  Now add --kallsyms to your perfhost\_linux command:
     ```
     ./perfhost_linux report -g -i perf.data --symfs symbols/ \
         --kallsyms=symbols/kallsyms
     ```