Exclude category.xml from spotless and match site.xml formatting (#54)

The eclipseWtp XML formatter had collapsed the category description onto
the <description> line with a leading space (flagged in review). Its
sibling Eclipse descriptors (site.xml, feature.xml, plugin.xml) are
already excluded from that formatter; add category.xml too, and format
its description on its own line to match site.xml.


Claude-Session: https://claude.ai/code/session_015krtPy49YGqBERvq4yDjCa

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: khatchad

edu.cuny.citytech.refactoring.common.updatesite/category.xml

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <site>
-  <feature id="edu.cuny.citytech.refactoring.common.feature" version="0.0.0">
-    <category name="edu.cuny.citytech.refactoring.category" />
-  </feature>
-  <category-def name="edu.cuny.citytech.refactoring.category" label="Common Refactoring Framework">
-    <description> A framework with some common functionality for refactoring tool development.
-    </description>
-  </category-def>
+   <feature id="edu.cuny.citytech.refactoring.common.feature" version="0.0.0">
+      <category name="edu.cuny.citytech.refactoring.category"/>
+   </feature>
+   <category-def name="edu.cuny.citytech.refactoring.category" label="Common Refactoring Framework">
+      <description>
+         A framework with some common functionality for refactoring tool development.
+      </description>
+   </category-def>
 </site>

pom.xml

@@ -195,6 +195,7 @@
                   <exclude>**/plugin.xml</exclude>
                   <exclude>**/feature.xml</exclude>
                   <exclude>**/site.xml</exclude>
+                  <exclude>**/category.xml</exclude>
                   <exclude>**/*.target</exclude>
                   <exclude>**/pom.xml</exclude>
                   <exclude>**/dependency-reduced-pom.xml</exclude>