User interface -> Commands example simplification

[VStankoV]

Hey @marcusolsson!
Thank you for this great tutorial! Excellent job!
Below is a small suggestion to reduce slightly cognitive load.

obsidian-plugin-docs/docs/user-interface/commands.md

Lines 47 to 58 in 82a284f

	checkCallback: (checking: boolean) => {
	const value = getRequiredValue();
	if (value) {
	if (!checking) {
	doCommand(value);
	}
	return true
	}
	return false;

would be easier to understand the logic behind this example if on line 58 we just return value; and remove line 55:

  checkCallback: (checking: boolean) => {
    const value = getRequiredValue();
    if (value) {
      if (!checking) {
        doCommand(value);
      }
    }
    return value;
  }