Fix s3 link in application docs example

[jcbowman]

Description of changes:
The current s3 link in the example implies that you must have RegionName in the url for an Application Resource's Location. This will give you an error implying that you are trying to use an application from the serverless application repository which is confusing.

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

[codecov-io]

Codecov Report

Merging #773 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #773   +/-   ##
========================================
  Coverage    94.18%   94.18%           
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  Files           67       67           
  Lines         2683     2683           
  Branches       478      478           
========================================
  Hits          2527     2527           
  Misses          80       80           
  Partials        76       76

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