message: doc: Remove irrelevant link to GitHub
  The doc nicely explains why the directory exists and it is
  irrelevant when it was introduced. Even if it was relevant,
  it could be trivially found out via `git log ./src/node/ | tail`
  without visiting GitHub
diff: @@ -15,8 +15,7 @@ As a rule of thumb, code in one of the [`src/node/`](./),
  calling code in the other directories directly, and only invoke it indirectly
  through the more limited [`src/interfaces/`](../interfaces/) classes.
  -The [`src/node/`](./) directory is a new directory introduced in
  -[#14978](https://github.com/bitcoin/bitcoin/pull/14978) and at the moment is
  +This directory is at the moment
  sparsely populated. Eventually more substantial files like
  [`src/validation.cpp`](../validation.cpp) and
  [`src/txmempool.cpp`](../txmempool.cpp) might be moved there.
  