Small editorial tweaks

Capitalize and shorten title
Rename some variables
Indent a little more

draft-ietf-quic-transport.md

@@ -4780,36 +4780,36 @@ from 0xFF00 to 0xFFFF are reserved for Private Use {{!RFC8126}}.
 
 --- back
 
-# Sample code for packet number decoding {#sample-packet-number-decoding}
+# Sample Packet Number Decoding Algorithm {#sample-packet-number-decoding}
 
 The following pseudo-code shows how an implementation can decode packet
-numbers after packet protection has been removed.
+numbers after packet number protection has been removed.
 
 ~~~
 DecodePacketNumber(largest_pn, truncated_pn, pn_nbits):
-	expected_pn  = largest_pn + 1
-	pn_len       = 1 << pn_nbits
-	pn_win       = pn_len / 2
-	pn_mask      = pn_len - 1
-	// The incoming packet number should be greater than
-	// expected_pn - pn_win and less than or equal to
-	// expected_pn + pn_win
-	//
-	// This means we can't just strip the trailing bits from
-	// expected_pn and add the truncated_pn because that might
-	// yield a value outside the window.
-	//
-	// The following code calculates a candidate value and
-	// makes sure it's within the packet number window.
-	candidate_pn = (expected_pn & ~pn_mask) | truncated_pn
-	if candidate_pn <= expected_pn - pn_win:
-		return candidate_pn + pn_len
-	// Note the extra check for underflow when candidate_pn
-	// is near zero.
-	if candidate_pn > expected_pn + pn_win and
-	   candidate_pn > pn_len:
-		return candidate_pn - pn_len
-	return candidate_pn
+	 expected_pn  = largest_pn + 1
+	 pn_win       = 1 << pn_nbits
+	 pn_hwin      = pn_win / 2
+	 pn_mask      = pn_win - 1
+	 // The incoming packet number should be greater than
+	 // expected_pn - pn_hwin and less than or equal to
+	 // expected_pn + pn_hwin
+	 //
+	 // This means we can't just strip the trailing bits from
+	 // expected_pn and add the truncated_pn because that might
+	 // yield a value outside the window.
+	 //
+	 // The following code calculates a candidate value and
+	 // makes sure it's within the packet number window.
+	 candidate_pn = (expected_pn & ~pn_mask) | truncated_pn
+	 if candidate_pn <= expected_pn - pn_hwin:
+	 	 return candidate_pn + pn_win
+	 // Note the extra check for underflow when candidate_pn
+	 // is near zero.
+	 if candidate_pn > expected_pn + pn_hwin and
+	    candidate_pn > pn_win:
+	  	return candidate_pn - pn_win
+	 return candidate_pn
 ~~~
 
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