docs: Document the new autoHeadingIDType setting

See gohugoio#6707 See gohugoio#6616
jakejarvis · Mar 5, 2021 · cc3c24b · cc3c24b
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diff --git a/docs/content/en/getting-started/configuration-markup.md b/docs/content/en/getting-started/configuration-markup.md
@@ -38,6 +38,9 @@ unsafe
 typographer
 : This extension substitutes punctuations with typographic entities like [smartypants](https://daringfireball.net/projects/smartypants/).
 
+autoHeadingIDType ("github") {{< new-in "0.62.2" >}}
+: The strategy used for creating auto IDs (anchor names). Available types are `github`, `github-ascii` and `blackfriday`. `github` produces GitHub-compatible IDs, `github-ascii` will drop any non-Ascii characters after accent normalization, and `blackfriday` will make the IDs work as with [Blackfriday](#blackfriday), the default Markdown engine before Hugo 0.60. Note that if Goldmark is your default Markdown engine, this is also the strategy used in the [anchorize](/functions/anchorize/) template func.
+
 ### Blackfriday