Fix download and doc links in gradle package

[gaiksaya]

Issue #, if available:
A community user found a bug in the links stated in package descriptions. check the post here

Description of changes:
Fix the download and document link in package description

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #287 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #287      +/-   ##
============================================
- Coverage     75.24%   75.22%   -0.03%     
+ Complexity      704      702       -2     
============================================
  Files            89       89              
  Lines          3919     3919              
  Branches        625      625              
============================================
- Hits           2949     2948       -1     
- Misses          640      643       +3     
+ Partials        330      328       -2     

Impacted Files	Coverage Δ	Complexity Δ
...ement/step/notification/AttemptNotificationStep.kt	57.57% <0.00%> (-15.16%)	5.00% <0.00%> (-1.00%)
...adata/TransportUpdateManagedIndexMetaDataAction.kt	85.18% <0.00%> (-3.71%)	9.00% <0.00%> (-1.00%)
...agement/indexstatemanagement/ManagedIndexRunner.kt	55.04% <0.00%> (-0.62%)	41.00% <0.00%> (ø%)
...dexstatemanagement/elasticapi/ElasticExtensions.kt	65.38% <0.00%> (+3.84%)	0.00% <0.00%> (ø%)
...exstatemanagement/model/destination/Destination.kt	48.52% <0.00%> (+4.41%)	7.00% <0.00%> (ø%)
...anagement/indexstatemanagement/model/Transition.kt	86.27% <0.00%> (+5.88%)	5.00% <0.00%> (ø%)

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