Update documentation.md

[davenice]

Describe your pull request here:
minor typo - Java instructions referred to TypeScript

List the file(s) included in this PR:
a tiny update in docs/contribute/guidelines-code/documentation.md

[github-actions]

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[zowe-robot]

/labels doc V3

The following labels are invalid: doc, V3

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/labels review:doc area:doc release:V3

The following labels are invalid: review:doc, area:doc, release:V3

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/labels review:docs area:docs release:V2

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[zowe-robot]

/labels review:doc

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[anaxceron]

Great catch, thank you @davenice!

[github-actions]

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