Update java.adoc around client routing

[jgardiner68]

Updated the headings to include "Client" as a prefix and "Routing" so that customers can read the announcement and find it in the documentation

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[rebekah-lawrence]

Have to say I am not totally on board with this for the following reasons:

• These are not headings; this is the list of the options; the options are ALL_MEMBERS, SINGLE_MEMBER, and MULTI_MEMBER
• The heading is Java Client Cluster Routing Modes to try and bridge the gap (in the best way James Holgate and I could come up with, but still a terrible noun beast kind of way) - but the code is cluster-routing, so it is difficult to avoid using cluster routing when documenting it
• There is explanatory text, and a tie in with the previous client operation mode settings

Questions:
a) Why does the announcement use different naming from the docs (which were written to match the extensive renaming exercise)?
b) Can't the announcement just link directly to https://docs.hazelcast.com/hazelcast/latest/clients/java#java-client-operation-modes so customers don't have to "find" the information?
c) Did you expect me to suddenly become easier to deal with in my last week ;-)

[jgardiner68]

Two reasons to do so:

1. Feedback via PSB members is some of them thought this feature relates cluster member routing.
2. improves search

Point (c) -- yes always surprising :-)

[rebekah-lawrence]

The potential for this confusion was discussed during the renaming rounds. Disappointing it still remains. This is really not a docs issue (whistles innocently)

I winced and used "Java client cluster routing mode" after the discussions in a desperate and unsatisfying attempt to cover this.

Tell you what I'll do, I'll skulk round the corner, and @oliverhowell can approve while I'm not looking - don't say I'm not good to you - but use this wisely; I still have more days to go and you won't get another pass 🤓