10530: Add link to ECS acronym to clarify. r=lnicola a=mirkoRainer

I had to ask a clarifying question about this acronym. If I had the question, it's likely that someone else will also have the question so I wanted to clarify.

Co-authored-by: Mirko Rainer <mirkorainer@outlook.com>
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@ -156,7 +156,7 @@ Files are represented with opaque `FileId`, there's no operation to get an `std:
These crates are the *brain* of rust-analyzer.
This is the compiler part of the IDE.
`hir_xxx` crates have a strong ECS flavor, in that they work with raw ids and directly query the database.
`hir_xxx` crates have a strong [ECS](https://en.wikipedia.org/wiki/Entity_component_system) flavor, in that they work with raw ids and directly query the database.
There's little abstraction here.
These crates integrate deeply with salsa and chalk.