message: ENH: update mint/README.md
  Fix numbered list in Mint's README.md + minor rephrasing.
diff: -Mint: Mesh data model {#minttop}
  +Mint: Mesh Data Model {#minttop}
  ============
  [Mint](@ref axom::mint) is a C++ library that provides:
  -#. A comprehensive [mesh](@ref axom::mint::Mesh) data model that can support
  +1. A comprehensive [mesh](@ref axom::mint::Mesh) data model that can support
  structured, unstructured and particle mesh discretizations.
  -#. A mesh-aware, fine-grain, parallel execution model that underpins the development of
  - computational tools and numerical discretization methods, enabling
  - implementations that are born *parallel* and *portable* to new and emerging
  - architectures.
  +2. A mesh-aware execution model that supports on-node fine-grain parallelism for
  + traversing and operating on a mesh.
  +
  +Mint serves as as fundmental building block that underpins the development of
  +computational tools and numerical discretization methods, enabling implementations
  +that are born *parallel* and *portable* to new and emerging architectures.
  The [Mint User Guide](https://axom.readthedocs.io/en/develop/axom/mint/docs/sphinx/index.html)
  introduces these concepts in more detail.
  