[MD settings] fix typo in comment

chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js

Index: chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
diff --git a/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js b/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
index b50e5369c1600258171553562ff9225e4a67b78c..b510502f3d3b8d3c31bb95c674bb3e6a3cd2c649 100644
--- a/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
+++ b/chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js
@@ -8,7 +8,7 @@
  */
 
 /**
- * The handler will send a police source that is similar, but not exactly the
+ * The handler will send a policy source that is similar, but not exactly the
  * same as a ControlledBy value. If the ContentSettingProvider is omitted it
  * should be treated as 'default'.
  * @enum {string}