botan: fix minor typo in Config.in file

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/botan/Config.in

@@ -16,7 +16,7 @@ config BR2_PACKAGE_BOTAN
 
 	  http://botan.randombit.net
 
-comment "botan needs a toolchain w/ C++, threads,gcc >= 4.8"
+comment "botan needs a toolchain w/ C++, threads, gcc >= 4.8"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP \
 		|| !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 	depends on BR2_PACKAGE_BOTAN_ARCH_SUPPORTS