Some improvements to the "with an entity" raycasting guide

[DorkOrc]

• Updates commands to use a marker entity rather than area_effect_cloud (which is worse and has particle artifacts in newer versions).
• Adds disclaimer about entity selecting not being 100% reliable.
• Adds alternative /execute summon usage.
• Adds disclaimer about vibration game events.
• Utilises /rotate command where only rotation is relevant.
• Includes type argument in selectors.

[EricristianBros]

Thanks DorkOrc for the PR,

I would add en explanation on using area_effect_cloud and tp instead of rotate for older versions, too, since not everybody plays on the latest versions and may be wondering why it does not work for them.
Also fix the typo "entitiies"