Issues with "Developing [modules/themes/layouts]" pages

[NormPlum]

As I was reading through these pages I noticed some issues that I will list here (specifically regarding the info file sections). Feel free to split them up into separate issues if you like.

The pages:

• https://docs.backdropcms.org/creating-modules
• https://docs.backdropcms.org/creating-themes
• https://docs.backdropcms.org/documentation/creating-layout-templates

The issues:

• The Themes pages says "The file must be saved as UTF-8 without a Byte Order Mark (BOM)." No other page mentions this, but I assume it applies to all info files.
• Maintainers are mentioned on the Modules page, but none of the others.
• The Modules page mentions which keys are optional, but other pages only mention when they're required.
• For module dependencies it gives the same example twice:

• For module dependencies it mentions you can also specify versions, after already giving examples of that: