Editorial: Clean up spec markdown

[shaseley]

• Use column width 100 (previously 80)
• Reorganize sections to not mix algorithms and data
• Factor out TaskSignal.any() algorithm
• Remove unnecessary "perform the following steps:" at the end of algorithm definitions
• Remove link tag conjugations that bikeshed can handle
• Use consistent heading syntax

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Preview | Diff

[shaseley]

He @clelland, would you mind reviewing this? I want to clean this up a bit before adding more. This is mostly mechanical -- see prpreview in first comment for diffs. Thanks!

[clelland]

The mechanical changes here all look good, as does the separation of the algorithm from the any() method steps.

[shaseley]

Thanks Ian!