fix sembr tool corner case

Author: tshepang

ci/sembr/src/main.rs

@@ -83,7 +83,8 @@ fn ignore(line: &str, in_code_block: bool) -> bool {
         || line.contains(" etc.")
         || line.contains("i.e.")
         || line.contains("et. al")
-        || line.contains("<!-- date-check ")
+        || line.contains("<!--")
+        || line.contains("-->")
         || line.contains('|')
         || line.trim_start().starts_with('>')
         || line.starts_with('#')
@@ -266,6 +267,11 @@ leave the
 text alone
 ```
 
+<!-- ignore
+html comment opening
+--> ignore
+html comment closing
+
  handle the
  indented well
 
@@ -292,6 +298,11 @@ leave the
 text alone
 ```
 
+<!-- ignore
+html comment opening
+--> ignore
+html comment closing
+
  handle the indented well
 
 [a target]: https://example.com

src/rustdoc-internals/rustdoc-json-test-suite.md

@@ -18,7 +18,8 @@ Each crate's json output is checked by 2 programs: [jsondoclint](#jsondocck) and
 This makes sure there are no dangling [`Id`]s.
 
 <!-- TODO: It does some more things too?
-Also, talk about how it works -->
+Also, talk about how it works
+ -->
 
 ## jsondocck