Update configure-http-server-proxy.md

By changes in Apache HTTP server, host part in the fcgi: URI was made necessary.
See https://lists.sympa.community/msg/en/2024-07/gEBkopK6LrG5orgF9JhpoQ

Author: ikedas

manual/install/configure-http-server-proxy.md

@@ -132,8 +132,8 @@ Instruction by HTTP servers
      ...
 
      <Location /sympa>
-         SetHandler "proxy:unix:$PIDDIR/wwsympa.socket|fcgi://"
-	 # Don't forget to edit lines below!
+         SetHandler "proxy:unix:$PIDDIR/wwsympa.socket|fcgi://localhost"
+         # Don't forget to edit lines below!
          Require local
          #Require all granted
      </Location>
@@ -160,8 +160,8 @@ Instruction by HTTP servers
 
      ```
      <Location /sympasoap>
-         SetHandler "proxy:unix:$PIDDIR/sympasoap.socket|fcgi://"
-	       # Don't forget to edit lines below!
+         SetHandler "proxy:unix:$PIDDIR/sympasoap.socket|fcgi://localhost"
+         # Don't forget to edit lines below!
          Require local
          #Require all granted
      </Location>