[7.4] 3d8c1800a man: Fix the scope of bereq protected headers

[Dridi Boukelmoune]

commit 3d8c1800aaafb7ba66e91e924a8d9803a131cf4b
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Sep 19 06:49:30 2023 +0200

    man: Fix the scope of bereq protected headers
    
    Refs #3984

diff --git a/doc/sphinx/reference/vcl_var.rst b/doc/sphinx/reference/vcl_var.rst
index 392e3efe7..faed3aaa9 100644
--- a/doc/sphinx/reference/vcl_var.rst
+++ b/doc/sphinx/reference/vcl_var.rst
@@ -742,7 +742,7 @@ bereq.http.content-length
 
 	Type: HEADER
 
-	Readable from: client
+	Readable from: backend
 
 	The content-length header field is protected, see protected_headers_.
 
@@ -751,7 +751,7 @@ bereq.http.transfer-encoding
 
 	Type: HEADER
 
-	Readable from: client
+	Readable from: backend
 
 	The transfer-encoding header field is protected, see protected_headers_.