CLEANUP: assorted typo fixes in the code and comments
These are mostly comments in the code. A few error messages were fixed
and are of low enough importance not to deserve a backport. Some regtests
were also fixed.
diff --git a/include/common/hpack-tbl.h b/include/common/hpack-tbl.h
index ca3f2aa..bb1ac06 100644
--- a/include/common/hpack-tbl.h
+++ b/include/common/hpack-tbl.h
@@ -52,7 +52,7 @@
* possible to maximize the delay before a collision of DTEs and data. In order
* to always insert from the right, we need to keep a reference to the latest
* inserted element and look before it. The last inserted cell's address defines
- * the lowest konwn address still in use, unless the area wraps in which case
+ * the lowest known address still in use, unless the area wraps in which case
* the available space lies between the end of the tail and the beginning of the
* head.
*