windows_pwa_integration.md: minor cleanup

Noticed two small cleanup opportunities while reading this doc.

Change-Id: Ic984937b1d462dc41c8f580807a3cdd40043ba2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2877770
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#880079}

docs/windows_pwa_integration.md

@@ -39,7 +39,7 @@ We use the hash due to 32-character limit for ProgID's. The registry work is
 done in
 [ShellUtil::AddFileAssociations](https://source.chromium.org/chromium/chromium/src/+/master:chrome/installer/util/shell_util.cc?q=%20ShellUtil::AddFileAssociations):
 
-* Register the ProgID by adding `key HKCU\Software\Classes\<progID>` to the registry.
+* Register the ProgID by adding key `HKCU\Software\Classes\<progID>` to the registry.
 * Set the application name and icon for the PWA with these two keys:
     * `HKCU\Software\Classes\<progID>\Application::ApplicationIcon = <path to icon in PWA install dir>,0`
     * `HKCU\Software\Classes\<progID>\Application::ApplicationName = <PWA name>`
@@ -47,7 +47,7 @@ done in
     * `HKCU\Software\Classes\<progID>\shell\open\command = <launcher_app_path_in_profile> --app-id=<app_id> --profile-directory=<profile_dir>`
 * Add a key to keep track of the file extensions registered for a progId,
 for ease of uninstallation:
-    * `HKCU\Software\Classes\<progId>\File Extensions = <semicolon delimited list of extensions>`
+    * `HKCU\Software\Classes\<progID>\File Extensions = <semicolon delimited list of extensions>`
 
 When Chrome is launched, it writes its path into the "Last Browser" file in
 the User Data dir.
@@ -75,4 +75,3 @@ application name.
  name and icon for a PWA. So, the file open context menu item for a PWA on
  Windows 7 gets its name from the launcher app created for the PWA, and uses a
  generic PWA icon.
-