Add a note on line-too-long to the formatter docs (#8314)

Suggested here:
https://github.com/astral-sh/ruff/discussions/7310#discussioncomment-7410638.

docs/faq.md

@@ -3,16 +3,18 @@
 ## Is the Ruff linter compatible with Black?
 
 Yes. The Ruff linter is compatible with [Black](https://github.com/psf/black) out-of-the-box, as
-long as the `line-length` setting is consistent between the two.
+long as the [`line-length`](settings.md#line-length) setting is consistent between the two.
 
 Ruff is designed to be used alongside a formatter (like Ruff's own formatter, or Black) and, as
 such, will defer implementing stylistic rules that are obviated by automated formatting.
 
-Note that Ruff and Black treat line-length enforcement a little differently. Black makes a
-best-effort attempt to adhere to the `line-length`, but avoids automatic line-wrapping in some cases
-(e.g., within comments). Ruff, on the other hand, will flag rule `E501` for any line that exceeds
-the `line-length` setting. As such, if `E501` is enabled, Ruff can still trigger line-length
-violations even when Black is enabled.
+Note that Ruff's linter and Black treat line-length enforcement a little differently. Black, like
+Ruff's formatter, makes a best-effort attempt to adhere to the
+[`line-length`](settings.md#line-length), but avoids automatic line-wrapping in some cases (e.g.,
+within comments). Ruff, on the other hand, will flag [`line-too-long`](rules/line-too-long.md)
+(`E501`) for any line that exceeds the [`line-length`](settings.md#line-length) setting. As such, if
+[`line-too-long`](rules/line-too-long.md) (`E501`) is enabled, Ruff can still trigger line-length
+violations even when Black or `ruff format` is enabled.
 
 ## How does Ruff's formatter compare to Black?
 

docs/formatter.md

@@ -183,7 +183,7 @@ some rules that, when enabled, can cause conflicts with the formatter, leading t
 behavior. When configured appropriately, the goal of Ruff's formatter-linter compatibility is
 such that running the formatter should never introduce new lint errors.
 
-As such, when using Ruff as a formatter, we recommend avoiding the following lint rules:
+When using Ruff as a formatter, we recommend avoiding the following lint rules:
 
 - [`tab-indentation`](rules/tab-indentation.md) (`W191`)
 - [`indentation-with-invalid-multiple`](rules/indentation-with-invalid-multiple.md) (`E111`)
@@ -200,6 +200,11 @@ As such, when using Ruff as a formatter, we recommend avoiding the following lin
 - [`single-line-implicit-string-concatenation`](rules/single-line-implicit-string-concatenation.md) (`ISC001`)
 - [`multi-line-implicit-string-concatenation`](rules/multi-line-implicit-string-concatenation.md) (`ISC002`)
 
+While the [`line-too-long`](rules/line-too-long.md) (`E501`) rule _can_ be used alongside the
+formatter, the formatter only makes a best-effort attempt to wrap lines at the configured
+[`line-length`](settings.md#line-length). As such, formatted code _may_ exceed the line length,
+leading to [`line-too-long`](rules/line-too-long.md) (`E501`) errors.
+
 None of the above are included in Ruff's default configuration. However, if you've enabled
 any of these rules or their parent categories (like `Q`), we recommend disabling them via the
 linter's [`ignore`](settings.md#ignore) setting.