docs: polish bundle for 0.3.0 (renv_version doc, distro removal, vignette cleanup, typos)

[VincentGuyader]

Summary

Bundles four documentation improvements surfaced by the pre-CRAN
audit. None changes runtime behaviour.

1. dock_from_renv() @param renv_version clarification (doc-only)

The argument has three distinct semantic modes that the original
doc described as "optional with a default", which a reader can
mistake for a 2-state argument. Explicitly document the three
modes:

• not supplied (default): read renv version from the lockfile,
  fall back to latest if not pinned.
• NULL (explicit): force latest, even when the lockfile pins.
• a character (e.g. "1.0.0"): use that exact version.

The missing-vs-NULL distinction is load-bearing in the function
body (a TDD POC trying to add a = NULL default broke 3 existing
tests; reverted in favor of doc-only).

2. Drop deprecated distro = ... from doc examples

distro has been deprecated since 0.2.3 and emits a warning()
on use. Three doc locations still showed it; removed:

• R/dock_from_renv.R @examples \dontrun{} block.
• README.Rmd renv example.
• vignettes/dockerfile-from-renv-lock.Rmd (deleted altogether,
  see create a dock$COMMENT() to add a comment in the Dockerfile #3).

3. Delete the empty placeholder vignette

vignettes/dockerfile-from-renv-lock.Rmd was a fusen template
that never got expanded into real content (50 lines, ~10 of which
are content, and that content was roxygen-syntax inside R-syntax
inside an Rmd chunk). A real "renv lockfile to Dockerfile"
vignette is worth writing post-CRAN; for now, deletion is the
honest move.

4. Cosmetic sweep

• vignettes/dockerfiler.Rmd: "Basic worflow" -> "Basic workflow".
• README.Rmd: same typo, plus repo = -> repos = in the
  install.packages() example wrapped by r().
• R/parse-dockerfile.R: "compatability" -> "compatibility".
• R/compact_sysreqs.R: French inline comment translated.
• R/get_sysreqs.R: drop a dead unlist(...) whose output was
  overwritten on the next line.

README.md is re-knit at the end of the bundle.

Test plan

• Each individual fix was prototyped on a separate local POC
  branch and verified R CMD check --as-cran 0/0/0 (5 / 5
  individually).
• The combined bundle was verified R CMD check --as-cran
  0/0/0 twice: once pre-rebase, once post-rebase on master
  after docs(vignette): point install_github at ThinkR-open instead of colinfay #103 landed.
• No NAMESPACE / behaviour change. Three roxygen-touching
  changes regenerate man/dock_from_renv.Rd accordingly.

Context

Étape 2 / 8 of the 0.3.0 CRAN-prep plan. Étape 1 was #103
(vignette fork rename, merged at a7215ec).

Refs the local prep report at
/home/ubuntu/thinkr-work/dockerfiler-cran-0.3.0-prep.md for
the full audit and rationale.

[Copilot]

Pull request overview

This PR bundles a set of documentation-focused cleanups ahead of the 0.3.0 release, clarifying dock_from_renv() semantics, removing deprecated distro usage from examples, deleting an unused placeholder vignette, and polishing minor wording/typos (plus one small internal code cleanup in get_sysreqs()).

Changes:

• Clarify the three-mode behavior of dock_from_renv(renv_version = ...) (missing vs NULL vs explicit version) in roxygen docs and the generated Rd.
• Remove deprecated distro = ... from examples and delete the unused dockerfile-from-renv-lock vignette stub.
• Fix small typos / wording in README + vignettes + comments; simplify get_sysreqs() by removing a dead statement.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
vignettes/dockerfiler.Rmd	Fixes a vignette section header typo (“workflow”).
vignettes/dockerfile-from-renv-lock.Rmd	Removes an unused placeholder vignette file.
README.Rmd	Fixes “workflow” typo, corrects install.packages() arg name (repos), and removes deprecated distro from the renv example.
README.md	Re-knit output reflecting the README.Rmd doc/example updates.
R/parse-dockerfile.R	Corrects spelling in a comment (“compatibility”).
R/get_sysreqs.R	Removes a dead unlist(...) call and tidies spacing in pak::pkg_sysreqs() invocation.
R/dock_from_renv.R	Documents the renv_version missing-vs-NULL distinction and removes deprecated distro from roxygen examples.
R/compact_sysreqs.R	Translates an inline comment to English.
man/dock_from_renv.Rd	Regenerated Rd reflecting the updated renv_version docs and example cleanup.

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