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/reg-tests/lua/bad_http_clt_req_duration.vtc b/reg-tests/lua/bad_http_clt_req_duration.vtc
index 2da5e87..c58c97e 100644
--- a/reg-tests/lua/bad_http_clt_req_duration.vtc
+++ b/reg-tests/lua/bad_http_clt_req_duration.vtc
@@ -16,7 +16,7 @@
 #       applet:start_response()
 #   end)
 #
-# This had as a consequence to log %TR field with approximatively the same value as
+# This had as a consequence to log %TR field with approximately the same value as
 # the LUA sleep time.
 
 varnishtest "LUA bug"