doc: remove some repeated words

PR rust-lang#1215

Author: riyueguang

regex-automata/src/util/look.rs

@@ -482,7 +482,7 @@ impl LookSet {
     /// assertions in this set that require tables that are not available, then
     /// this will return an error.
     ///
-    /// Specifically, this returns an error when the the
+    /// Specifically, this returns an error when the
     /// `unicode-word-boundary` feature is _not_ enabled _and_ this set
     /// contains a Unicode word boundary assertion.
     ///

regex-lite/src/string.rs

@@ -329,7 +329,7 @@ impl Regex {
     /// The `0`th capture group is always unnamed, so it must always be
     /// accessed with `get(0)` or `[0]`.
     ///
-    /// Finally, one other way to to get the matched substrings is with the
+    /// Finally, one other way to get the matched substrings is with the
     /// [`Captures::extract`] API:
     ///
     /// ```

src/regex/bytes.rs

@@ -336,7 +336,7 @@ impl Regex {
     /// The `0`th capture group is always unnamed, so it must always be
     /// accessed with `get(0)` or `[0]`.
     ///
-    /// Finally, one other way to to get the matched substrings is with the
+    /// Finally, one other way to get the matched substrings is with the
     /// [`Captures::extract`] API:
     ///
     /// ```

src/regex/string.rs

@@ -338,7 +338,7 @@ impl Regex {
     /// The `0`th capture group is always unnamed, so it must always be
     /// accessed with `get(0)` or `[0]`.
     ///
-    /// Finally, one other way to to get the matched substrings is with the
+    /// Finally, one other way to get the matched substrings is with the
     /// [`Captures::extract`] API:
     ///
     /// ```