Rollup merge of rust-lang#121352 - malobre:patch-1, r=Nilstrieb

docs: add missing "the" to `str::strip_prefix` doc

Fix rust-lang#121348

library/core/src/str/mod.rs

@@ -2192,8 +2192,8 @@ impl str {
 
     /// Returns a string slice with the prefix removed.
     ///
-    /// If the string starts with the pattern `prefix`, returns substring after the prefix, wrapped
-    /// in `Some`.  Unlike `trim_start_matches`, this method removes the prefix exactly once.
+    /// If the string starts with the pattern `prefix`, returns the substring after the prefix,
+    /// wrapped in `Some`. Unlike `trim_start_matches`, this method removes the prefix exactly once.
     ///
     /// If the string does not start with `prefix`, returns `None`.
     ///