nix-vector-routing: Update doc on IPv6, examples and usage

Ameya Deshpanderequested to merge
ameyanrd/ns-3-dev:nix-docs into master

Nix-Vector documentation updates. The changes are:

  1. Update the documentation on IPv6 capabilities.
  2. Update the usage of Nix API in doc
  3. Update the examples section usage.
  4. Update the limitations subsection

Signed-off-by: Ameya Deshpande ameyanrd@outlook.com

Edited by Tommaso Pecorella

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