PTO force bug

[jtgrasb]

Description

Fixes two bugs identified by Issue #368:

1. Corrects the force attribute in pto.post_process() from "Force or moment on WEC" to "PTO force or torque"
2. Updates tutorial 1 to constrain the pto.force() rather than the pto.force_on_wec().

Type of PR

• Bug fix

Checklist for PR

• Authors read the contribution guidelines
• The pull request is from an issue branch (not main) on your fork, to the dev branch in WecOptTool.
• The authors have given the admins edit access
• All changes adhere to the style guide including PEP8, Docstrings, and Type Hints.
• Modified the documentation if applicable
• Modified or added a new test
• All tests pass
• Reference or close any relevant issues

Additional details

N/A

[coveralls]

Pull Request Test Coverage Report for Build 11061238892

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 94.583%

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Totals
Change from base Build 10375743799:	0.07%
Covered Lines:	2776
Relevant Lines:	2935

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💛 - Coveralls

[dtgaebe]

Looks good. Thanks