MINOR: cli: limit spelling suggestions to 5

There's no need to suggest up to 10 entries for matching keywords,
most of the times 5 are plenty, and will be more readable.
diff --git a/include/haproxy/cli-t.h b/include/haproxy/cli-t.h
index 61c9881..450781a 100644
--- a/include/haproxy/cli-t.h
+++ b/include/haproxy/cli-t.h
@@ -42,7 +42,7 @@
 #define APPCTX_CLI_ST1_NOLF    (1 << 2)
 
 #define CLI_PREFIX_KW_NB 5
-#define CLI_MAX_MATCHES 10
+#define CLI_MAX_MATCHES 5
 
 /* CLI states */
 enum {