doc: fix some typos

PR #856

Author: cuishuang

CHANGELOG.md

@@ -683,7 +683,7 @@ New features:
 * Empty sub-expressions are now permitted in most places. That is, `()+` is
   now a valid regex.
 * Almost everything in regex-syntax now uses constant stack space, even when
-  performing anaylsis that requires structural induction. This reduces the risk
+  performing analysis that requires structural induction. This reduces the risk
   of a user provided regular expression causing a stack overflow.
 * [FEATURE #174](https://github.com/rust-lang/regex/issues/174):
   The `Ast` type in `regex-syntax` now contains span information.

bench/src/sherlock.rs

@@ -149,12 +149,12 @@ sherlock!(before_holmes, r"\w+\s+Holmes", 319);
 // and suffix optimizations.
 sherlock!(before_after_holmes, r"\w+\s+Holmes\s+\w+", 137);
 
-// Find Holmes co-occuring with Watson in a particular window of characters.
+// Find Holmes co-occurring with Watson in a particular window of characters.
 // This uses Aho-Corasick for the Holmes|Watson prefix, but the lazy DFA for
 // the rest.
 sherlock!(holmes_cochar_watson, r"Holmes.{0,25}Watson|Watson.{0,25}Holmes", 7);
 
-// Find Holmes co-occuring with Watson in a particular window of words.
+// Find Holmes co-occurring with Watson in a particular window of words.
 // This uses Aho-Corasick for the Holmes|Watson prefix, but the lazy DFA for
 // the rest.
 #[cfg(not(feature = "re-onig"))]