CLEANUP: assorted typo fixes in the code and comments

This is 13n iteration of typo fixes
diff --git a/reg-tests/log/log_uri.vtc b/reg-tests/log/log_uri.vtc
index 934a3ef..00f0553 100644
--- a/reg-tests/log/log_uri.vtc
+++ b/reg-tests/log/log_uri.vtc
@@ -1,4 +1,4 @@
-varnishtest "Verify logging of relative/aboslute URI path"
+varnishtest "Verify logging of relative/absolute URI path"
 feature ignore_unknown_macro
 
 server s1 {