[Documentation] Changing leader_cluster to leader_alias in readme file

[Rishikesh1159]

Signed-off-by: Rishikesh1159 rishireddy1159@gmail.com

Description

This PR replaces "leader_cluster" with "leader_alias" in readme file.

Issues Resolved

#452

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[ankitkala]

LGTM

[codecov-commenter]

Codecov Report

Merging #453 (3070edd) into main (6130d6f) will decrease coverage by 0.46%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #453      +/-   ##
============================================
- Coverage     74.63%   74.17%   -0.47%     
+ Complexity     1006     1001       -5     
============================================
  Files           141      141              
  Lines          4565     4565              
  Branches        504      504              
============================================
- Hits           3407     3386      -21     
- Misses          841      858      +17     
- Partials        317      321       +4     

Impacted Files	Coverage Δ
...rch/replication/action/status/ShardInfoResponse.kt	72.26% <0.00%> (-19.33%)	⬇️
...rch/replication/task/index/IndexReplicationTask.kt	71.06% <0.00%> (-0.24%)	⬇️
...arch/replication/task/autofollow/AutoFollowTask.kt	74.32% <0.00%> (+1.35%)	⬆️
...ation/task/shard/ShardReplicationChangesTracker.kt	63.63% <0.00%> (+3.03%)	⬆️

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