Issue #1213: XDK instructions link for www template is incorrect

[dansumption]

Description

Updated URL in PHONEGAP_BUILD markdown to reflect changed structure of linked repo.

Related Issue

#1213

Motivation and Context

Fixes broken link.

How Has This Been Tested?

Tested in my fork - link now works.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[macdonst]

@dansumption thanks!

[lock]

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