Issue #2979166 by RajeevK, lomasr: Wrong documentation on SiteCacheContext class

core/lib/Drupal/Core/Cache/Context/SiteCacheContext.php

@@ -7,7 +7,7 @@
 /**
  * Defines the SiteCacheContext service, for "per site" caching.
  *
- * Cache context ID: 'site'.
+ * Cache context ID: 'url.site'.
  *
  * A "site" is defined as the combination of URI scheme, domain name, port and
  * base path. It allows for varying between the *same* site being accessed via