Wrong documentation on Timeout middleware

[nevivurn]

Issue Description

The Timeout middleware godoc is wrong.

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Expected behaviour

The godocs for the Timeout handler should describe what it does.

Actual behaviour

The godocs for the Timeout handler describe what the Recover middleware does.

Steps to reproduce

Working code to debug

$ go doc github.com/labstack/echo/v4/middleware.Timeout
package middleware // import "github.com/labstack/echo/v4/middleware"

func Timeout() echo.MiddlewareFunc
    Timeout returns a middleware which recovers from panics anywhere in the
    chain and handles the control to the centralized HTTPErrorHandler.

Version/commit

All commits since 67263b5, the first commit where the Timeout middleware function was introduced.