Update TZUpdater readme.
(https://www.oracle.com/java/technologies/javase/tzupdater-readme.html#issues)

We need to add one issue to the Known issue list and one old issue has to be removed

Known issue to be added:

To update a JDK installation to tzdata2024b, the following workaround is available for jdk8 and above versions:
Run the TZUpdater tool as follows:
1. Download tzdata bundle from https://data.iana.org/time-zones/releases/tzdata2024b.tar.gz
2. Extract tzdata2024b.tar.gz contents to a local directory
3. Open northamerica file and modify the rule entry on line number 2634 in 'IN' column from 'April' to 'Apr' as per the below patch in IANA:
https://github.com/eggert/tz/commit/926b507fa5c3192b1b68fab5910cbd3ba9377c97
4. Tar and gzip the modified bundle (sample command : tar -czvf {directory path where modified tar bundle to be created}/tzdata_modified.tar.gz * )
5. run the tzupdater, passing the modified bundle path in -l option (sample :$ java -jar tzupdater.jar -l file://{path of modified tar}/tzdata_modified.tar.gz)
The issue is being tracked under:
https://bugs.openjdk.org/browse/JDK-8339645


Known issue to be removed:

tzdata2018e and later
Since the 2018e tzdata release, the TZUpdater tool will need to use the rearguard format of tzdata provided by IANA. Further information can be found at:

https://bugs.openjdk.java.net/browse/JDK-8195595
https://bugs.openjdk.java.net/browse/JDK-8212684
The rearguard format of tzdata is provided for compatibility purposes. The tz-announce mails contain links to the relevant rearguard formats which should be used with the TZUpdater tool. Use the -l feature of the tool to specify which tzdata bundle should be used.

For example:

java -jar tzupdater.jar -l https://web.cs.ucla.edu/~eggert/tz/release/2019a/tzdata2019a-rearguard.tar.gz