Fix minor bugs related of Spotless SQL config extension docs (#1277 fixes #1256)

Author: nedtwigg

plugin-gradle/README.md

@@ -528,7 +528,7 @@ spotless {
 ```gradle
 spotless {
   sql {
-    dbeaver().configFile('dbeaver.props') // configFile is optional
+    dbeaver().configFile('dbeaver.properties') // configFile is optional
 ```
 
 Default configuration file, other options [available here](https://github.com/diffplug/spotless/blob/main/lib/src/main/java/com/diffplug/spotless/sql/dbeaver/DBeaverSQLFormatterConfiguration.java).

plugin-maven/README.md

@@ -524,7 +524,7 @@ Groovy-Eclipse formatting errors/warnings lead per default to a build failure. T
 
 ```xml
 <dbeaver>
-    <configFile>dbeaver.props</configFile> <!-- configFile is optional -->
+    <configFile>dbeaver.properties</configFile> <!-- configFile is optional -->
 </dbeaver>
 ```