(IAC-579) Release prep v6.3.0

[sheenaajay]

Request for a review.
1.Generated changelog
2.Generated References.
3.Modify the function examples to show in correct format
4.Acceptance tests running clean on github actions and travis
5.Unit tests running clean on travis(in github action its failing-ruby version is different in github 2.6.3 on travis 2.5.7)

[codecov-io]

Codecov Report

Merging #1102 into release will increase coverage by 0.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           release   #1102      +/-   ##
==========================================
+ Coverage     4.58%   5.50%   +0.91%     
==========================================
  Files          185     185              
  Lines         5229    5229              
==========================================
+ Hits           240     288      +48     
+ Misses        4989    4941      -48     

Impacted Files	Coverage Δ
lib/puppet/functions/stdlib/end_with.rb	0.00% <ø> (ø)
lib/puppet/functions/stdlib/start_with.rb	0.00% <ø> (ø)
lib/puppet/type/file_line.rb	96.36% <0.00%> (+1.81%)	⬆️
lib/puppet/provider/file_line/ruby.rb	62.62% <0.00%> (+47.47%)	⬆️

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