Fix typo (#2254)

Author: Godin

plugin-gradle/README.md

@@ -237,7 +237,7 @@ spotless {
     eclipse('4.26').configFile('eclipse-prefs.xml')
     // if the access to the p2 repositories is restricted, mirrors can be
     // specified using a URI prefix map as follows:
-    echlise().withP2Mirrors(['https://download.eclipse.org/eclipse/updates/4.29/':'https://some.internal.mirror/4-29-updates-p2/'])
+    eclipse().withP2Mirrors(['https://download.eclipse.org/eclipse/updates/4.29/':'https://some.internal.mirror/4-29-updates-p2/'])
        
 ```