glibc: fix description

target/config/Config.in.libc

@@ -200,7 +200,7 @@ config ADK_LIBC_VERSION
 	string
 	default "1.0.31" if ADK_TARGET_LIB_UCLIBC_NG_1_0_31
 	default "1.1.23" if ADK_TARGET_LIB_MUSL_1_1_23
-	default "2.28" if ADK_TARGET_LIB_GLIBC_2_28
+	default "2.30" if ADK_TARGET_LIB_GLIBC_2_30
 	default "3.0.0" if ADK_TARGET_LIB_NEWLIB_3_0_0
 	default "git" if ADK_TARGET_LIB_UCLIBC_NG_GIT || \
 		         ADK_TARGET_LIB_MUSL_GIT || \