fix javadoc

Author: rahul2393

google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/SsFormat.java

@@ -143,7 +143,7 @@ public static void appendNotNullMarkerNullOrderedLast(GrowableByteArrayOutputStr
    * Appends a boolean value in ascending (increasing) sort order.
    *
    * <p>Boolean values are encoded using unsigned integer encoding where false=0 and true=1. This
-   * preserves the natural ordering where false < true.
+   * preserves the natural ordering where false &lt; true.
    *
    * @param out the output stream to append to
    * @param value the boolean value to encode
@@ -161,7 +161,7 @@ public static void appendBoolIncreasing(GrowableByteArrayOutputStream out, boole
    * Appends a boolean value in descending (decreasing) sort order.
    *
    * <p>Boolean values are encoded using unsigned integer encoding where false=0 and true=1, then
-   * inverted for descending order. This preserves reverse ordering where true < false.
+   * inverted for descending order. This preserves reverse ordering where true &lt; false.
    *
    * @param out the output stream to append to
    * @param value the boolean value to encode