message: Update C# documentation for 8.2.0
diff: @@ -20,7 +20,7 @@ different versioning scheme, following the Haskell community's
  ### C++ ###
  * gRPC v1.17.1 is now required to use Bond-over-gRPC.
  -* Fixed an ambigious `HexDigit` overload compilation error when
  +* Fixed an ambiguous `HexDigit` overload compilation error when
  compiling with some versions of GCC. ([Pull request
  #954](https://github.com/Microsoft/bond/pull/954))
  * Fixed ambiguous call to `maybe::operator==` that breaks GCC 9
  