docs(conf) documents server_tokens and latency_tokens configurati…

…on fields.

See: Kong/kong#2259

app/docs/0.10.x/configuration.md

@@ -421,6 +421,24 @@ exceeded, the least recently used connections are closed.
 
 Default: `60`
 
+---
+
+##### **server_tokens**
+
+Enables or disables emitting Kong version on error pages and in the "Server" or "Via"
+(in case the request was proxied) response header field.
+
+Default: `on`
+
+---
+
+##### **latency_tokens**
+
+Enables or disables emitting Kong latency information in the "X-Kong-Proxy-Latency" 
+and "X-Kong-Upstream-Latency" response header fields.
+
+Default: `on`
+
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