use FHIR definition and maybe include a reference.

Existing Wording:

In FSH, authors must specify the slicing logic parameters using structure definition escape (caret) syntax. First they identify the element to be sliced, which is typically a multi-cardinality element. Then they traverses the structure definition at that point

Proposed Wording:

In FSH, authors must specify the slicing logic parameters using structure definition escape (caret) syntax. First they identify the element to be sliced, which is typically a multi-cardinality element. Then they traverses the StructureDefinition at that point