Add additional docs to Query::bind

sqlx-core/src/query.rs

@@ -65,6 +65,13 @@ where
     DB: Database,
 {
     /// Bind a value for use with this SQL query.
+    ///
+    /// If the number of times this is called does not match the number of bind parameters that
+    /// appear in the query (`?` for most SQL flavors, `$1 .. $N` for Postgres) then an error
+    /// will be returned when this query is executed.
+    ///
+    /// There is no validation that the value is of the type expected by the query. Most SQL
+    /// flavors will perform type coercion (Postgres will return a database error).s
     pub fn bind<T>(mut self, value: T) -> Self
     where
         T: Type<DB>,