message: Slightly rephrase a difficult-to-parse sentence.
diff: @@ -142,9 +142,9 @@ maps", and those with no symbols as "non-symbolic affine maps".
  dimension indices and symbols into a list of results, with affine expressions
  combining the indices and symbols. Affine maps distinguish between
  [indices and symbols](#dimensions-and-symbols) because indices are inputs to the
  -affine map when the latter may be called through an operation, such as
  -[affine.apply](#affineapply-operation) operation, whereas symbols are bound when
  -an affine mapping is established (e.g. when a memref is formed, establishing a
  +affine map when the map is called (through an operation such as
  +[affine.apply](#affineapply-operation)), whereas symbols are bound when
  +the map is established (e.g. when a memref is formed, establishing a
  memory [layout map](../LangRef.md#layout-map)).
  Affine maps are used for various core structures in MLIR. The restrictions we
  