If you just want to map your $HOME between host and guest you don't
need to mess around with namespaces however a novice (like myself!)
might not get that from reading the section. Expand the section to
outline this common use case and hopefully prevent users falling too
far down the namespace rabbit hole if they don't need to.

Signed-off-by: Alex Bennée <[email protected]>

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v2
  - fix grammar nits:
    - s/as an/a a/
    - s/different to/different from/
    - drop base in guest/host base UID as we only map 1
    - replace paragraph with Hana's suggestion