Fix bad config property in privacy.md (GoogleContainerTools#4036)

Co-authored-by: Mridula <66699525+mpeddada1@users.noreply.github.com>

docs/privacy.md

@@ -11,7 +11,7 @@ and version.
 ### How to disable update checks
 
 1. set the `jib.disableUpdateChecks` system property to `true`
-2. set `disableUpdateChecks` to `true` in Jib's global config. The global config is in the following locations by default:
+2. set `disableUpdateCheck` to `true` in Jib's global config. The global config is in the following locations by default:
     * Linux: `$XDG_CONFIG_HOME/google-cloud-tools-java/jib/config.json` (if `$XDG_CONFIG_HOME` is defined), else `$HOME/.config/google-cloud-tools-java/jib/config.json`
     * Mac: `$XDG_CONFIG_HOME/Google/Jib/config.json` (if `$XDG_CONFIG_HOME` is defined), else `$HOME/Library/Preferences/Google/Jib/config.json`
     * Windows: `$XDG_CONFIG_HOME\Google\Jib\Config\config.json` (if `$XDG_CONFIG_HOME` is defined), else `%LOCALAPPDATA%\Google\Jib\Config\config.json`