Clarify the lens exercise description (#2092)
Clarify the lens exercise description (#2092)

* Clarify the lens exercise description

This PR improves the Lens exercise description in two ways:
1. Expand the description a bit to convey _why_ updating nested records are annoying
2. Remove direct reference to Haskell, as this is intended as a generic description

* Update exercises/lens-person/description.md

Co-authored-by: Erik Schierboom <6e321e24be838c7616721fdb824f9c65569cbfd8@hotmail.com>

* Change text to have one sentence per line

Co-authored-by: Erik Schierboom <6e321e24be838c7616721fdb824f9c65569cbfd8@hotmail.com>
jmluy/x-common,jmluy/x-common,jmluy/x-common