Keyboard Nav dialog should include checkboxes

[KatieWoe]

Test device Dell Operating System Win 11 Browser Chrome Problem description For https://github.com/phetsims/qa/issues/926. Discussed with @terracoda over zoom. The keyboard nav dialog says that to press a button you should use enter or space. However, to press a checkbox you must use space. There are a number of checkboxes, but this instruction is not included.

Troubleshooting information:

!!!!! DO NOT EDIT !!!!! Name: ‪Quadrilateral‬ URL: https://phet-dev.colorado.edu/html/quadrilateral/1.0.0-rc.2/phet/quadrilateral_all_phet.html Version: 1.0.0-rc.2 2023-04-04 16:04:39 UTC Features missing: applicationcache, applicationcache, touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 Language: en-US Window: 1280x649 Pixel Ratio: 1.5/1 WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium) GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 30 uniform: 4096 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32) Max viewport: 32767x32767 OES_texture_float: true Dependencies JSON: {}

[jessegreenberg]

Thanks @KatieWoe and @terracoda, added to master and cherry-picked into the 1.0 branch. dependencies.json was updated. To be verified in next RC.

[KatieWoe]

Looks good in rc.3