Fix doc_markdown off by one issue

clippy_lints/src/doc.rs

@@ -238,7 +238,7 @@ fn check_doc<'a, Events: Iterator<Item = (usize, pulldown_cmark::Event<'a>)>>(
 }
 
 fn check_text(cx: &EarlyContext<'_>, valid_idents: &[String], text: &str, span: Span) {
-    for word in text.split_whitespace() {
+    for word in text.split(|c: char| c.is_whitespace() || c == '\'') {
         // Trim punctuation as in `some comment (see foo::bar).`
         //                                                   ^^
         // Or even as in `_foo bar_` which is emphasized.

tests/ui/doc.rs

@@ -177,3 +177,7 @@ fn issue_1832() {}
 
 /// Ok: CamelCase (It should not be surrounded by backticks)
 fn issue_2395() {}
+
+/// An iterator over mycrate::Collection's values.
+/// It should not lint a `'static` lifetime in ticks.
+fn issue_2210() {}

tests/ui/doc.stderr

@@ -180,5 +180,11 @@ error: you should put bare URLs between `<`/`>` or make a proper Markdown link
 175 | /// Not ok: http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels
     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 30 previous errors
+error: you should put `mycrate::Collection` between ticks in the documentation
+   --> $DIR/doc.rs:181:22
+    |
+181 | /// An iterator over mycrate::Collection's values.
+    |                      ^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 31 previous errors