Fix links in documentation

Author: tomaswolf

docs/changes/3.0.0-M1.md

@@ -8,7 +8,7 @@ Includes all the features and bug fixes of [version 2.16.0](./2.16.0.md) and up
 
 ## Major Code Re-factoring
 
-* The `AbstractSession` has been completely refactored. Most of its code has been moved out of this class into separate filters in a filter chain. For details, see the [technical documentation](./docs/technical/filters.md).
+* The `AbstractSession` has been completely refactored. Most of its code has been moved out of this class into separate filters in a filter chain. For details, see the [technical documentation](../technical/filters.md).
 * Handling of global requests has been moved from `AbstractSession` to the `ConnectionService`.
 * KEX temporarily closes `RemoteWindow`s, preventing data to be written in that way until KEX is over. Version 2 blocked threads in a different, more convoluted, and fragile way.
 * Deprecated API has been removed.
@@ -23,9 +23,9 @@ Includes all the features and bug fixes of [version 2.16.0](./2.16.0.md) and up
 ## New Features
 
 * Random padding on SSH packets as suggested by [RFC 4253, section 6](https://datatracker.ietf.org/doc/html/rfc4253#section-6).
-* New event callback `SessionListener.sessionStarting()`. See the [filter documentation](./docs/technical/filters.md). `SessionListener.sessionEstablished()` was removed; it was called from the constructor of `AbstractSession` at a time when the object was not yet fully initialized.
+* New event callback `SessionListener.sessionStarting()`. See the [filter documentation](../technical/filters.md). `SessionListener.sessionEstablished()` was removed; it was called from the constructor of `AbstractSession` at a time when the object was not yet fully initialized.
 * [GH-728](https://github.com/apache/mina-sshd/issues/728) New method `ClientSession.getHostConfigEntry()` to get the `HostConfigEntry` for the session.
-* [GH-729](https://github.com/apache/mina-sshd/issues/729) Support for client-side SOCKS5 or HTTP CONNECT proxies. See the [documentation](./docs/client-setup.md#proxies).
+* [GH-729](https://github.com/apache/mina-sshd/issues/729) Support for client-side SOCKS5 or HTTP CONNECT proxies. See the [documentation](../client-setup.md#proxies).
 * The [OpenSSH "hostkeys-00@openssh.com" host key rotation extension](https://github.com/openssh/openssh-portable/blob/b5b405fee/PROTOCOL#L367) is now implemented client-side. New host keys so received are registered on the session but we don't update the `known_hosts` file. If you want that, implement your own `NewHostKeysHandler` and set it on the `SshClient`.