ERC Authors Fix Code Glitch with Crucial Diamond Standard Update

ERC-8109's exportSelectors() function referenced non-existent `functionFacetPairs.selector`. Authors fixed errant code to align with ERC-8153's IDiamondInspect interface. Revision removes reference to incorrect ERC-2535. The corrected example clarifies a crucial distinction for developers working with diamond-standard facets and encourages careful review of documentation to avoid similar mistakes in future projects. This fix may prevent unforeseen errors.