wpa_supplicant: Fix non_pref_chan example

The parsing code expects non_pref_chan to be non-quoted.
Fix the example in wpa_supplicant.conf not to include
quotes.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>

wpa_supplicant/wpa_supplicant.conf

@@ -688,7 +688,7 @@ fast_reauth=1
 # Format:
 # non_pref_chan=<oper_class>:<chan>:<preference>:<reason>
 # Example:
-# non_pref_chan="81:5:10:2 81:1:0:2 81:9:0:2"
+# non_pref_chan=81:5:10:2 81:1:0:2 81:9:0:2
 
 # MBO Cellular Data Capabilities
 # 1 = Cellular data connection available