GlobalFilter documentation should be update WRT Order

Describe the bug
The documentation WRT GlobalFilter and ordering suggests that GlobalFilter and GatewayFilter order can be controls via the Ordered interface (or @Ordered annotation). However, it appears that regardless of the GlobalFilter order, the GatewayFilters are applied first. This should be clarified in the documentation or (preferably) fixed so that a GlobalFilter with a higher precedence than a GatewayFilter will be applied first.

From: https://docs.spring.io/spring-cloud-gateway/reference/spring-cloud-gateway/global-filters.html
"When a request matches a route, the filtering web handler adds all instances of GlobalFilter and all route-specific instances of GatewayFilter to a filter chain. This combined filter chain is sorted by the org.springframework.core.Ordered interface, which you can set by implementing the getOrder() method."

This comment is what clued me in:
https://github.com/spring-cloud/spring-cloud-gateway/issues/2784#issuecomment-1318424901

Start with the Global Filters documentation page and the linked comment in issue 2784, then trace how GlobalFilter and route-specific GatewayFilter ordering is described and implemented. Clarify the documented behavior or align the implementation with Ordered precedence, with the documentation and observed filter order agreeing when the work is done.