Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: mathieucarbou

src/WebRequest.cpp

@@ -32,7 +32,7 @@ enum {
 enum {
   CHUNK_NONE = 0,   // Body transfer encoding is not chunked
   CHUNK_LENGTH,     // Getting chunk length - HHHH[;...] CR LF
-  CHUNK_EXTENSION,  // Getting chunk length - HHHH[;...] CR LF
+  CHUNK_EXTENSION,  // Getting chunk extension - ;... CR LF
   CHUNK_DATA,       // Handling chunk data
   CHUNK_ERROR,      // Invalid chunk header
   CHUNK_END,        // Getting chunk end marker  - CR LF