ICU-23054 Fix javadoc tags that prevent publishing

Author: mihnita

icu4j/main/core/src/main/java/com/ibm/icu/segmenter/Segments.java

@@ -26,7 +26,7 @@
  *
  * Segments segments = wordSeg.segment("Das 21ste Jahrh. ist das beste.");
  *
- * List<CharSequence> words = segments.subSequences().collect(Collectors.toList());
+ * List&lt;CharSequence&gt; words = segments.subSequences().collect(Collectors.toList());
  * </pre></blockquote>
  *
  * @see Segmenter

icu4j/main/core/src/main/java/com/ibm/icu/text/RuleBasedNumberFormat.java

@@ -419,7 +419,7 @@
  *     <td>Format the number unchanged</td>
  *   </tr>
  *   <tr style="border-top: 1px solid black;">
- *     <td style="white-space: nowrap;" rowspan="6">[]<br/>[|]</td>
+ *     <td style="white-space: nowrap;" rowspan="6">[]<br>[|]</td>
  *     <td style="white-space: nowrap; vertical-align: top; padding-left: 1em; padding-right: 1em;">in normal rule</td>
  *     <td>
  *       <ul>