Document AddDays and AddHours date filters

[NickJosevski]

Documents the AddDays and AddHours variable filters added in Octostache 3.9.3, shipping in Octopus Server 2026.3.11319.

Changes

variable-filters.md — an ### AddDays and AddHours section under Date filters, plus rows in the date-filters table.

Covers negative amounts, fractional amounts (which must be quoted, since an unquoted filter argument can't contain a decimal point), time-zone preservation, and the echo-on-bad-input behaviour. Every value in the examples was produced by running the expression through the implementation rather than written by hand.

The section ends with a worked ServiceNow change-window example, and a warning that Octopus.Task.QueueTime is queue time rather than execution start — so a window derived from it starts counting down while the task is still queued.

Second commit

Fixes pre-existing markdownlint violations in this file. CI lints only changed files, so editing the page surfaces violations that already fail on main. Scoped to what the linter actually reports — two misaligned tables, asterisk list markers, a hard tab, trailing whitespace, duplicate blank lines, a missing blank line after a heading. Each table keeps its own separator style, so the diff stays close to what the rules require.

Note

An earlier revision of this PR also added the filters to the flat list in variable-substitutions.mdx. That list has since been removed on main — the page now links to this one for the full set — so the change was dropped when resolving the merge.

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