CLEANUP: assorted typo fixes in the code and comments

This is 25th iteration of typo fixes

(cherry picked from commit 01881087fc0ad9922d6d5833766e30c032da1e1d)
[wt: dropped non-relevant parts]
Signed-off-by: Willy Tarreau <w@1wt.eu>
diff --git a/INSTALL b/INSTALL
index 480a468..85e8e8f 100644
--- a/INSTALL
+++ b/INSTALL
@@ -179,7 +179,7 @@
 regex engine which could be slow or even crash on certain patterns.
 
 If you plan on importing a particularly heavy configuration involving a lot of
-regex, you may benefit from using some alternative regex implementations sur as
+regex, you may benefit from using some alternative regex implementations such as
 PCRE. HAProxy natively supports PCRE and PCRE2, both in standard and JIT
 flavors (Just In Time). The following options are available depending on the
 library version provided on your system :