Fix typo in contributor docs

[zelf0]

Increasing Access

Grammar and spelling mistakes can make documentation harder to read.

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build Process
• Unit Testing
• Internalization
• Friendly Errors
• Other (specify if possible)

Feature enhancement details

Fix misspelling of inspect and grammar error

[welcome]

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