#1918: fix typos in contributing documentation

[tineff96]

This PR fixes #1918

Implemented changes:

• corrected minor typos and wording

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
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  with internal

[CLAassistant]

All committers have signed the CLA.

[coveralls]

Coverage Report for CI Build 25805764228

Coverage remained the same at 70.678%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• 1 coverage regression across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

1 previously-covered line in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/version/VersionSegment.java	1	90.55%

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Coverage Stats

Relevant Lines:	15475
Covered Lines:	11397
Line Coverage:	73.65%
Relevant Branches:	6918
Covered Branches:	4430
Branch Coverage:	64.04%
Branches in Coverage %:	Yes
Coverage Strength:	3.12 hits per line

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💛 - Coveralls