v15.1.0.md: fix wrong syntax highlighting

[XhmikosR]

So, this is a tricky one.

1. the build errors aren't real errors; the build continued and resulted in wrong highlighting, see for example https://github.com/nodejs/nodejs.org/runs/1896479847#step:6:31. AFAICT this is by design in the metalsmith-prism package: https://github.com/Availity/metalsmith-prism/blob/8db23a433d600b3fd13e33779cbd264e053d7caf/lib/index.js#L41-L47
2. maybe this should be implemented in the changelog maker or something?

Before:

After:

Any of these should do the job: shell-session, sh-session, shellsession

[targos]

LGTM, thanks!

Is the rule to always use shell-session instead of console ? The issue I see is that GitHub doesn't highlight it at all: https://github.com/nodejs/nodejs.org/blob/22ced65f915b3899683f0309154d58470ad8cc0b/locale/en/blog/release/v15.1.0.md#take-a-v8-heap-snapshot-just-before-running-out-of-memory-experimental
It's okay for nodejs.org, but the same markdown source is used for the changelog at https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V15.md#take-a-v8-heap-snapshot-just-before-running-out-of-memory-experimental and https://github.com/nodejs/node/releases/tag/v15.1.0

[XhmikosR]

Is the rule to always use shell-session instead of console ?

Any of shell-session, sh-session, shellsession will work with prismjs, but yeah, this isn't what GitHub's syntax highlighting works with.

Hence why I think there should be some kind of enforcement for this specific case which we have hit more than once (#2923)

[XhmikosR]

The other options would be

1. ask upstream in prismjs to add an alias for this
2. see if we can do this manually
3. switch to another solution altogether

[targos]

Maybe we can do something in the release post script to transform occurences of ```console to ```shell-session ?

[XhmikosR]

Yup, that could work, but I'm not sure I have the time to propose a patch :)

That being said, a fix there along with a test case should be a pretty good fix.