Tidy comments in qcbor_common.h (#125)

Some private stuff was moved out of qcbor_common.h to qcbor_private.h.  All the comments are now /* */, not //.  Grammar check on qcbor_common.h


* more comment fix ups

* grammar, formatting

* All comments /* */

* line spacing

---------

Co-authored-by: Laurence Lundblade <lgl@securitytheory.com>
diff --git a/test/qcbor_decode_tests.c b/test/qcbor_decode_tests.c
index 7adb7a2..b3bf91d 100644
--- a/test/qcbor_decode_tests.c
+++ b/test/qcbor_decode_tests.c
@@ -1011,7 +1011,7 @@
                     UsefulBuf_FROM_BYTE_ARRAY_LITERAL(spTooDeepArrays),
                     QCBOR_DECODE_MODE_NORMAL);
 
-   for(i = 0; i < QCBOR_MAX_ARRAY_NESTING1; i++) {
+   for(i = 0; i < QCBOR_MAX_ARRAY_NESTING; i++) {
 
       if(QCBORDecode_GetNext(&DCtx, &Item) != 0 ||
          Item.uDataType != QCBOR_TYPE_ARRAY ||