docs/index.md: Fix typos
@@ -42,13 +42,13 @@ You should give HsLua a try if you
HsLua exposes most of Lua's C API via Haskell functions. It offers
improved type-safety when compared to the raw C functions, while
also translating Lua errors to Haskell exceptions. Furthermore,
-HsLua provides an convenience functions which make interacting
-with Lua straight-forward and safe.
+HsLua provides convenience functions and helpers that make
+interacting with Lua straight-forward and safe.
### Showcases
-Possibly the best-known real world use case of HsLua is used in
-[pandoc], the universal document converter, where it serves as a
+Possibly the best-known real world use case of HsLua is [pandoc],
+the universal document converter, where it serves as a central
building block for [Lua filters] and [custom writers].
[Santa's little Lua scripts], originally written for [Advent of
