Add documentation for fields authors, keywords, repository, license, template fields of Ballerina.toml

[gayaldassanayake]

Description

In https://ballerina.io/learn/package-references/, we are missing the above-mentioned fields. While they are not a must-have in a package, they will improve the usability of a package view in the central API docs.

Related website/documentation area

Add/Uncomment the relevant area label out of the following.

Area/LearnPages

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Describe your solution(s)

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