Document how to disable Idle Timeout (#2189)

Author: ami-GS

docs/Settings.md

@@ -27,7 +27,7 @@ The following settings are available via registry as well as via [QUIC_SETTINGS]
 |------------------------------------|------------|-----------------------------|-------------------|-------------------------------------------------------------------------------------------------------------------------------|
 | Max Bytes per Key                  | uint64_t   | MaxBytesPerKey              |   274,877,906,944 | Maximum number of bytes to encrypt with a single 1-RTT encryption key before initiating key update.                           |
 | Handshake Idle Timeout             | uint64_t   | HandshakeIdleTimeoutMs      |            10,000 | How long a handshake can idle before it is discarded.                                                                         |
-| Idle Timeout                       | uint64_t   | IdleTimeoutMs               |            30,000 | How long a connection can go idle before it is gracefully shut down.                                                          |
+| Idle Timeout                       | uint64_t   | IdleTimeoutMs               |            30,000 | How long a connection can go idle before it is gracefully shut down. 0 to disable timeout                                                          |
 | Max TLS Send Buffer (Client)       | uint32_t   | TlsClientMaxSendBuffer      |             4,096 | How much client TLS data to buffer.                                                                                           |
 | Max TLS Send Buffer (Server)       | uint32_t   | TlsServerMaxSendBuffer      |             8,192 | How much server TLS data to buffer.                                                                                           |
 | Stream Receive Window              | uint32_t   | StreamRecvWindowDefault     |            32,768 | Initial stream receive window size.                                                                                           |

docs/api/QUIC_SETTINGS.md

@@ -109,7 +109,7 @@ How long a handshake can idle before it is discarded.
 
 `IdleTimeoutMs`
 
-How long a connection can go idle before it is gracefully shut down.
+How long a connection can go idle before it is gracefully shut down. 0 to disable timeout.
 
 **Default value:** 30,000