slightly tweak description of b_list in comments

[sl4mmy]

I noticed a small typo in the comment describing the use of b_list in
struct basicblock_ ("... that the block are allocated"). Reviewing the
other comments describing use of b_list I then noticed a slight
inconsistency in the description of what it actually points to ("next,"
"early") which I also decided to address here.

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[MaxwellDupre]

Better.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[sl4mmy]

I signed the CLA, is there anything else I need to do to get this merged?

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