Fix formatting in whereFrom docstring

Previously it used markdown syntax rather than Haddock syntax for code quotes

libraries/ghc-internal/src/GHC/Internal/InfoProv.hsc

@@ -94,13 +94,13 @@ peekInfoProv infop = do
     }
 
 -- | Get information about where a value originated from.
--- This information is stored statically in a binary when `-finfo-table-map` is
+-- This information is stored statically in a binary when @-finfo-table-map@ is
 -- enabled.  The source positions will be greatly improved by also enabled debug
--- information with `-g3`. Finally you can enable `-fdistinct-constructor-tables` to
+-- information with @-g3@. Finally you can enable @-fdistinct-constructor-tables@ to
 -- get more precise information about data constructor allocations.
 --
 -- The information is collect by looking at the info table address of a specific closure and
--- then consulting a specially generated map (by `-finfo-table-map`) to find out where we think
+-- then consulting a specially generated map (by @-finfo-table-map@) to find out where we think
 -- the best source position to describe that info table arose from.
 --
 -- @since base-4.16.0.0