Remove unnecessary nginx redirect rule from reverse proxy documentati…

…on (apache#38953)

* Update run-behind-proxy.rst

Remove redirect rule for flower config as per https://airflow.apache.org/docs/apache-airflow/stable/security/flower.html#flower-url-prefix

* Update run-behind-proxy.rst

* Removed comment about flower uri redirect
* Merged nginx server blocks into one

docs/apache-airflow/howto/run-behind-proxy.rst

@@ -53,23 +53,15 @@ Your reverse proxy (ex: nginx) should be configured as follow:
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection "upgrade";
         }
-      }
-
-- rewrite the url for the flower endpoint::
 
-      server {
-          listen 80;
-          server_name lab.mycompany.com;
-
-          location /myorg/flower/ {
-              rewrite ^/myorg/flower/(.*)$ /$1 break;  # remove prefix from http header
-              proxy_pass http://localhost:5555;
-              proxy_set_header Host $http_host;
-              proxy_redirect off;
-              proxy_http_version 1.1;
-              proxy_set_header Upgrade $http_upgrade;
-              proxy_set_header Connection "upgrade";
-          }
+        location /myorg/flower/ {
+            proxy_pass http://localhost:5555;
+            proxy_set_header Host $http_host;
+            proxy_redirect off;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+        }
       }
 
 To ensure that Airflow generates URLs with the correct scheme when