Fixed debugging messages to account that limit_zone was renamed to limit_conn.

src/http/modules/ngx_http_limit_conn_module.c

diff --git a/src/http/modules/ngx_http_limit_conn_module.c b/src/http/modules/ngx_http_limit_conn_module.c
index c23c046..106da7a 100644
--- a/src/http/modules/ngx_http_limit_conn_module.c
+++ b/src/http/modules/ngx_http_limit_conn_module.c
@@ -238,7 +238,7 @@
         }
 
         ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                       "limit zone: %08XD %d", node->key, lc->conn);
+                       "limit conn: %08XD %d", node->key, lc->conn);
 
         ngx_shmtx_unlock(&shpool->mutex);
 
@@ -358,7 +358,7 @@
     ngx_shmtx_lock(&shpool->mutex);
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lccln->shm_zone->shm.log, 0,
-                   "limit zone cleanup: %08XD %d", node->key, lc->conn);
+                   "limit conn cleanup: %08XD %d", node->key, lc->conn);
 
     lc->conn--;