Update docs b/c skipValidation=true removed from /price

`skipValidation` is no longer hard-coded to `true` from changes made in 0xProject/0x-api#804
This PR updates the docs to reflect this change.

Author: Jessica Lin

mdx/api/index.mdx

@@ -709,7 +709,7 @@ Nearly identical to [`/swap/v1/quote`](#get-swapv1quote), but with a few key dif
 
 ### Request
 
-Identical to the request schema for `/swap/v1/quote`, with one exception: the `skipValidation` parameter will always be considered to be `true`, even when a `takerAddress` has been specified.
+Identical to the request schema for `/swap/v1/quote`.
 
 ### Response