Fix doctest on GHC 9.2-9.6 without multiple hidden (#2605)

Author: christiaanb

clash-prelude/src/Clash/Prelude/BlockRam.hs

@@ -846,7 +846,7 @@ readNew (blockRam (0 :> 1 :> Nil))
      ... =>
      Signal dom addr -> Signal dom (Maybe (addr, a)) -> Signal dom a
 
-#elif __GLASGOW_HASKELL__ >= 906 && !defined(CLASH_MULTIPLE_HIDDEN)
+#elif __GLASGOW_HASKELL__ >= 902 && !defined(CLASH_MULTIPLE_HIDDEN)
 >>> :t readNew (blockRam (0 :> 1 :> Nil))
 readNew (blockRam (0 :> 1 :> Nil))
   :: ...