MINOR: Fix typo for the headers.separator cli option (#20489)

Should be `headers.separator=<headers.separator>` instead of
`headers.separator=<line.separator>`

Reviewers: Kuan-Po Tseng <[email protected]>, Ken Huang
 <[email protected]>, Chia-Ping Tsai <[email protected]>

Author: lkokhreidze

tools/src/main/java/org/apache/kafka/tools/consumer/ConsoleConsumerOptions.java

@@ -111,7 +111,7 @@ public ConsoleConsumerOptions(String[] args) throws IOException {
                             " print.value=true|false\n" +
                             " key.separator=<key.separator>\n" +
                             " line.separator=<line.separator>\n" +
-                            " headers.separator=<line.separator>\n" +
+                            " headers.separator=<headers.separator>\n" +
                             " null.literal=<null.literal>\n" +
                             " key.deserializer=<key.deserializer>\n" +
                             " value.deserializer=<value.deserializer>\n" +

tools/src/main/java/org/apache/kafka/tools/consumer/ConsoleShareConsumerOptions.java

@@ -83,7 +83,7 @@ public ConsoleShareConsumerOptions(String[] args) throws IOException {
                                 " print.value=true|false\n" +
                                 " key.separator=<key.separator>\n" +
                                 " line.separator=<line.separator>\n" +
-                                " headers.separator=<line.separator>\n" +
+                                " headers.separator=<headers.separator>\n" +
                                 " null.literal=<null.literal>\n" +
                                 " key.deserializer=<key.deserializer>\n" +
                                 " value.deserializer=<value.deserializer>\n" +