Fix broken Javadoc HTML tags

Author: garydgregory

src/main/java/org/apache/commons/lang3/CharSequenceUtils.java

@@ -215,20 +215,17 @@ static int lastIndexOf(final CharSequence cs, final CharSequence searchChar, int
     /**
      * Returns the index within {@code cs} of the last occurrence of the specified character, searching backward starting at the specified index. For values of
      * {@code searchChar} in the range from 0 to 0xFFFF (inclusive), the index returned is the largest value <em>k</em> such that:
-     * </p>
      *
      * <pre>
      * (this.charAt(<em>k</em>) == searchChar) &amp;&amp; (<em>k</em> &lt;= start)
      * </pre>
-     *
      * <p>
      * is true. For other values of {@code searchChar}, it is the largest value <em>k</em> such that:
      * <p>
      *
      * <pre>
      * (this.codePointAt(<em>k</em>) == searchChar) &amp;&amp; (<em>k</em> &lt;= start)
      * </pre>
-     *
      * <p>
      * is true. In either case, if no such character occurs in {@code cs} at or before position {@code start}, then {@code -1} is returned.
      * </p>

src/main/java/org/apache/commons/lang3/LocaleUtils.java

@@ -68,7 +68,7 @@ private static final class SyncAvoid {
     /**
      * The undetermined language {@value}.
      * <p>
-     * If a language is empty, or not <em>well-formed</am> (for example "a" or "e2"), {@link Locale#toLanguageTag()} will return {@code "und"} (Undetermined).
+     * If a language is empty, or not <em>well-formed</em> (for example "a" or "e2"), {@link Locale#toLanguageTag()} will return {@code "und"} (Undetermined).
      * </p>
      *
      * @see Locale#toLanguageTag()

src/main/java/org/apache/commons/lang3/builder/ToStringStyle.java

@@ -483,7 +483,7 @@ private static final class SimpleToStringStyle extends ToStringStyle {
         }
 
         /**
-         * Ensure <code>Singleton</ode> after serialization.
+         * Ensure <code>Singleton</code> after serialization.
          *
          * @return the singleton
          */