docs: improve Docker documentation

[HonkingGoose]

Changes:

Big:

• Rewrite to use simpler version number where possible
• Use myimage instead of node for version number examples
• Use latest SHA256 digest for Node 14.15.1 in examples
• Rewrite some sections to be more clear and use simpler language
• Bigger rewrites to improve clarity and simplicity

Smaller:

• Capitalize noun SemVer
• Fix white-space in list items, use 1.'s to number items
• Always use word files at end of list item
• Mention docker-compose.yml by name in list item
• Use active voice style for list items
• Use American English spelling for word behavior
• Fix typos
• Change h5 headings to h3 level headings

Context:

Helps with issue #7626.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added unit tests, or
• Unit tests + ran on a real repository

[HonkingGoose]

@rarkins This is ready for another round of review. 😄 Can you check my work with the version numbers, and see if it makes sense to you?

I've also rewritten the confusing section that mentioned why you should switch from major only tags to major.minor.patch tags, so that you can see what the Renovate PR is going to change. I'm looking forward to your feedback/suggestions to make this text better if needed.

[rarkins]

Use myimage instead of node in examples. Any similar name would suffice too - let's just use one that is not known to the user already and is clearly a "dummy" name

[HonkingGoose]

Use myimage instead of node in examples. Any similar name would suffice too - let's just use one that is not known to the user already and is clearly a "dummy" name

That was a really good idea, it's way clearer now. Thanks! 😄

[HonkingGoose]

I'll go fix the merge conflict 😄.

---

Edit: it's fixed now.

[renovate-release]

🎉 This PR is included in version 24.1.0 🎉

The release is available on:

• GitHub release
• 24.1.0

Your semantic-release bot 📦🚀