Update html comments in mdtests

crates/ty_python_semantic/resources/mdtest/assignment/annotations.md

@@ -927,12 +927,12 @@ def _(a: int | None):
 
 Regression test for [#1611](https://github.com/astral-sh/ty/issues/1611).
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 # error: [invalid-syntax]
 # error: [invalid-syntax-in-forward-annotation]
 a:'
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->

crates/ty_python_semantic/resources/mdtest/generics/legacy/paramspec.md

@@ -298,14 +298,14 @@ it having the same AST as the one without the parentheses. Both mypy and Pyright
 reveal_type(OnlyParamSpec[(int, str)]().attr)  # revealed: (int, str, /) -> None
 ```
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 # error: [invalid-syntax]
 reveal_type(OnlyParamSpec[]().attr)  # revealed: (...) -> None
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->
 
 The square brackets can be omitted when `ParamSpec` is the only type variable
 

crates/ty_python_semantic/resources/mdtest/generics/pep695/paramspec.md

@@ -22,7 +22,7 @@ def foo1[**P]() -> None:
 TODO: This results in a lot of syntax errors mainly because the AST doesn't accept them in this
 position. The parser could do a better job in recovering from these errors.
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 # error: [invalid-syntax]
@@ -37,7 +37,7 @@ def foo[**P: int]() -> None:
     pass
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->
 
 ## Default
 
@@ -255,14 +255,14 @@ it having the same AST as the one without the parentheses. Both mypy and Pyright
 reveal_type(OnlyParamSpec[(int, str)]().attr)  # revealed: (int, str, /) -> None
 ```
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 # error: [invalid-syntax]
 reveal_type(OnlyParamSpec[]().attr)  # revealed: (...) -> None
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->
 
 The square brackets can be omitted when `ParamSpec` is the only type variable
 

crates/ty_python_semantic/resources/mdtest/import/star.md

@@ -1485,7 +1485,7 @@ _Z: bool = True
 
 `b.py`:
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 from a import *, _Y  # error: [invalid-syntax]
@@ -1509,6 +1509,6 @@ from a import *, _Y as fooo  # error: [invalid-syntax]
 from a import *, *, _Y  # error: [invalid-syntax]
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->
 
 [python language reference for import statements]: https://docs.python.org/3/reference/simple_stmts.html#the-import-statement

crates/ty_python_semantic/resources/mdtest/suppressions/ty_ignore.md

@@ -75,7 +75,7 @@ def test(a: f"f-string type annotation", b: b"byte-string-type-annotation"): ...
 
 ## Can't suppress syntax errors
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 # error: [invalid-syntax]
@@ -84,7 +84,7 @@ def test($):  # ty: ignore
     pass
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->
 
 ## Can't suppress `revealed-type` diagnostics
 
@@ -127,14 +127,14 @@ a = 10 / 0  # ty: ignore[*-*]
 
 ## Trailing whitespace
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```py
 a = 10 / 0  # ty: ignore[division-by-zero]       
             #                               ^^^^^^ trailing whitespace
 ```
 
-<!-- blacken-docs:on -->
+<!-- fmt:on -->
 
 ## Missing comma
 

crates/ty_python_semantic/resources/mdtest/t_strings.md

@@ -2,7 +2,7 @@
 
 (NB: `black` does not support Python 3.14 at the time of this writing)
 
-<!-- blacken-docs:off -->
+<!-- fmt:off -->
 
 ```toml
 [environment]

crates/ty_test/src/parser.rs

@@ -520,7 +520,7 @@ impl<'s> Parser<'s> {
         const SECTION_CONFIG_SNAPSHOT: &str = "snapshot-diagnostics";
         const SECTION_CONFIG_PULLTYPES: &str = "pull-types:skip";
         const SECTION_CONFIG_EXPECT_PANIC: &str = "expect-panic";
-        const HTML_COMMENT_ALLOWLIST: &[&str] = &["blacken-docs:on", "blacken-docs:off"];
+        const HTML_COMMENT_ALLOWLIST: &[&str] = &["fmt:on", "fmt:off"];
         const CODE_BLOCK_END: &[u8] = b"```";
         const HTML_COMMENT_END: &[u8] = b"-->";
 
@@ -2066,13 +2066,13 @@ mod tests {
         let source = dedent(
             "
             # Some header
-            <!-- blacken-docs:off -->
+            <!-- fmt:off -->
 
             ```py
             x = 1
             ```
 
-            <!-- blacken-docs:on -->
+            <!-- fmt:on -->
             ",
         );
         let parse_result = super::parse("file.md", &source);