misc: correct spelling in comment

Author: SATYAsasini

nginx.conf

@@ -20,7 +20,7 @@ http {
     #tcp_nopush     on;
     keepalive_timeout  65;
 
-    # gzip compresion
+    # gzip compression
     gzip  on;
     gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;
     gzip_vary on;