docs(ref): Include example of ignore-next-line

Author: epage

crates/typos-cli/tests/cmd/ignore-next-line.in/_typos.toml

@@ -0,0 +1,5 @@
+[default]
+extend-ignore-re = ["(#|//)\\s*spellchecker:ignore-next-line\\n.*"]
+
+[default.extend-identifiers]
+hello = "goodbye"

crates/typos-cli/tests/cmd/ignore-next-line.in/file.ignore

@@ -0,0 +1,6 @@
+hello
+# spellchecker:ignore-next-line
+hello
+# spellchecker:ignore-next-line
+henlo
+hello

crates/typos-cli/tests/cmd/ignore-next-line.toml

@@ -0,0 +1,18 @@
+bin.name = "typos"
+stdin = "--sort"
+stdout = """
+error: `hello` should be `goodbye`
+  --> ./file.ignore:1:1
+  |
+1 | hello
+  | ^^^^^
+  |
+error: `hello` should be `goodbye`
+  --> ./file.ignore:6:1
+  |
+6 | hello
+  | ^^^^^
+  |
+"""
+stderr = ""
+status.code = 2

docs/reference.md

@@ -44,6 +44,7 @@ Configuration is read from the following (in precedence order)
 Common `extend-ignore-re`:
 - Line ignore with trailing `# spellchecker:disable-line`: `"(?Rm)^.*(#|//)\\s*spellchecker:disable-line$"`
 - Line block with `# spellchecker:<on|off>`: `"(?s)(#|//)\\s*spellchecker:off.*?\\n\\s*(#|//)\\s*spellchecker:on"`
+- Next-line ignore `# spellchecker:ignore-next-line`: `(#|//)\\s*spellchecker:ignore-next-line\\n.*`
 - See also [ripsecret's regexes](https://github.com/sirwart/ripsecrets/blob/main/src/lib.rs)
 
 Common `extend-ignore-identifiers-re`: