Overview#ChangeCipherSpec describes a Step within the TLS Handshake process.
Then the client sends a ChangeCipherSpec message, which is not a handshake message: it has its own record type, so it will be sent in a record of its own. Its contents are purely symbolic (a single byte of value 1). This message marks the point at which the client switches to the newly negotiated Cipher Suite and Master Secret Key. The subsequent records from the client will then be sent using Encryption.