doc: Minor typo fixes in Dijkstra description

[s373nZ]

Fixed typos and standardized English spelling of "neighbor" to match the variable names in the Dijkstra algorithm explanation.

Changelog-None

Checklist

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• The changelog has been updated in the relevant commit(s) according to the guidelines.
• Tests have been added or modified to reflect the changes.
• Documentation has been reviewed and updated as needed.
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[ShahanaFarooqui]

@s373nZ This PR requires git rebase for fixing FreeBSD Test but I do not have permission to commit.

[s373nZ]

Rebased against master at 43b09e7.

Thanks, @ShahanaFarooqui -- the "Allow edits... by maintainers" box is checked for the PR, so not sure why you can't commit, but hopefully the rebase will be recent enough.