Issue 1065 update docs and add conformance to ExpressibleByStringInterpolation

[chojnac]

Resolves #1065 #1064

Short description 📝

This PR fixes 2 issues:

1. Fix missing value name reported in the issue Incorrect documentation #1065
2. Fix compilation errors in the same example (Project+Templates.swift) Failure to pass interpolated string to InfoPlist, SourceFilesGlob, FileElement #1064

Solution 📦

The problem with compilation errors is caused by using string interpolation with types InfoPlist, SourceFileGlob and FileElement which only implements ExpressibleByStringLiteral.
The solution is to add for these types conformance to ExpressibleByStringInterpolation protocol.

Implementation 👩‍💻👨‍💻

• Add conformance to ExpressibleByStringInterpolation for selected types
• Add missing value name in the example code

[codecov]

Codecov Report

Merging #1081 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1081   +/-   ##
=======================================
  Coverage   78.84%   78.84%           
=======================================
  Files         238      238           
  Lines       11346    11346           
=======================================
  Hits         8946     8946           
  Misses       2400     2400

Impacted Files	Coverage Δ
Sources/ProjectDescription/SourceFilesList.swift	62.85% <ø> (ø)	⬆️
Sources/ProjectDescription/Path.swift	100% <ø> (ø)	⬆️
Sources/ProjectDescription/FileElement.swift	88.88% <ø> (ø)	⬆️

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[pepicrft]

Thanks for fixing this @chojnac. Would you mind adding an entry to the CHANGELOG? We can merge afterwards.

[chojnac]

Thanks for fixing this @chojnac. Would you mind adding an entry to the CHANGELOG? We can merge afterwards.

done