Clarify semantics of --to-channel

Dependencies

• [2] PB4TGMG7 implicitly describe shortcuts
• [3] GLUD3ZVF Generating the reference
• [*] SCSV2FNS Reboot

Change contents

• replacement in src/the_nest/contributing.md at line 21
  [3.14615]→[2.503:603](∅→∅)
  − In the special case where the <code><em>name</em></code> of the channel is `main`, you can omit it.
  [3.14615]
  + In the special case where your current channel and the <code><em>name</em></code> of the Nest channel match, you can omit <code><em>name</em></code>.