Pset_PipeFittingOccurrence.md uses American spelling "Color" instead of "Colour"

The ## Comments section of Pset_PipeFittingOccurrence.md references a property named Color, but the canonical base definition in docs/properties/ uses the IFC-standard British spelling Colour.md. This mismatch caused the pset-specific extension not to be rendered

Start in Pset_PipeFittingOccurrence.md and compare the ## Comments reference with the canonical definition in docs/properties/Colour.md. Correct the spelling so the pset-specific extension renders, then verify that the property is recognized and displayed using the repository’s documentation workflow.

Written by the indexing model from the issue text.