package/nginx: fix symmetric typo

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit acbff448619596895267e972ebc2bdad2b0fb12b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nginx/nginx.mk

@@ -93,7 +93,7 @@ endif
 # - pcre-jit          (want to rebuild pcre)
 
 # Notes:
-# * Feature/module option are *not* symetric.
+# * Feature/module option are *not* symmetric.
 #   If a feature is on by default, only its --without-xxx option exists;
 #   if a feature is off by default, only its --with-xxx option exists.
 # * The configure script fails if unknown options are passed on the command