docs(reference): switch typed-API migration guide to elasticsearch.NewTypedFrom

[MattDevy]

Summary

Updates the typed-API reference documentation for the (*Client).ToTyped() → elasticsearch.NewTypedFrom(c) migration introduced in #1474.

Two files touched:

• docs/reference/low-level-api/migration.md: rewrites the "Get a full typed client from an existing low-level client" section around elasticsearch.NewTypedFrom. Adds a "Migrating from v9.4.0" subsection explaining the rename and the binary-size rationale, and notes why the replacement is a free function rather than a method.
• docs/reference/typed-api/index.md: updates a cross-link from client.ToTyped() to elasticsearch.NewTypedFrom(client).

Depends on: #1474. That PR removes (*Client).ToTyped() and adds elasticsearch.NewTypedFrom. Land it first so this doc is not describing a non-existent API.

Test plan

• Confirm the rendered docs render correctly (mermaid diagram unchanged, code samples valid, asciidoc/MD anchors resolve).
• Confirm the cross-link from typed-api/index.md → low-level-api/migration.md still anchors correctly.

Note on branch name

The branch is still named docs/1472-bridge-totyped-migration from an earlier design iteration that exposed the conversion via a typedapi/bridge sub-package. The final design (matching #1474) is a single free function elasticsearch.NewTypedFrom. The branch name doesn't affect the squash-merged commit.

[prodsecmachine]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

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[github-actions]

🔍 Preview links for changed docs

• docs/reference/low-level-api/migration.md
• docs/reference/typed-api/index.md

[github-actions]

Vale Linting Results

Summary: 1 warning, 3 suggestions found

⚠️ Warnings (1)

File	Line	Rule	Message
docs/reference/low-level-api/migration.md	257	Elastic.DontUse	Don't use 'just'.

💡 Suggestions (3)

File	Line	Rule	Message
docs/reference/low-level-api/migration.md	280	Elastic.WordChoice	Consider using 'deactivate, deselect, hide, turn off' instead of 'disable', unless the term is in the UI.
docs/reference/low-level-api/migration.md	302	Elastic.Semicolons	Use semicolons judiciously.
docs/reference/typed-api/index.md	55	Elastic.Ellipses	In general, don't use an ellipsis.

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The Vale linter checks documentation changes against the Elastic Docs style guide.

To use Vale locally or report issues, refer to Elastic style guide for Vale.

[github-actions]

Binary size vs main (threshold: +10%)

Fixtures: internal/cmd/binsize, built with go build -trimpath on linux/amd64.

Variant	Base	PR	Delta	%
base	9.04 MB	9.04 MB	+0.00 MB	0.00%
client	69.80 MB	69.80 MB	+0.00 MB	0.00%
typed	50.64 MB	50.64 MB	+0.00 MB	0.00%

All binaries within +10% of base.

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
⚠️ MARKDOWN	markdownlint	2		4	0	0.65s
✅ REPOSITORY	gitleaks	yes		no	no	33.16s
✅ REPOSITORY	git_diff	yes		no	no	0.7s

Detailed Issues

⚠️ MARKDOWN / markdownlint - 4 errors

docs/reference/low-level-api/migration.md:306:401 MD013/line-length Line length [Expected: 400; Actual: 510]
docs/reference/low-level-api/migration.md:314:401 MD013/line-length Line length [Expected: 400; Actual: 530]
docs/reference/low-level-api/migration.md:318:401 MD013/line-length Line length [Expected: 400; Actual: 417]
docs/reference/typed-api/index.md:55:401 MD013/line-length Line length [Expected: 400; Actual: 571]

See detailed reports in MegaLinter artifacts
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