Name blob argument for consistency

The other methods/functions name it msg

README.rst

@@ -25,7 +25,7 @@ SYNOPSIS
   
   new xdigest = blobdigest.digest(ENUM hash, BLOB init, ENUM scope)
   
-      BOOL xdigest.update(BLOB)
+      BOOL xdigest.update(BLOB msg)
    
       BLOB xdigest.final()
    
@@ -46,7 +46,7 @@ SYNOPSIS
 ::
 
   new OBJECT = blobdigest.digest(ENUM hash [, BLOB init], ["TASK"|"TOP"])
-  BOOL <obj>.update(BLOB)
+  BOOL <obj>.update(BLOB msg)
   BLOB <obj>.final()
 
   BLOB blobdigest.hash(ENUM hash, BLOB msg)
@@ -266,11 +266,11 @@ Example::
 
 .. _xdigest.update():
 
-BOOL xdigest.update(BLOB)
--------------------------
+BOOL xdigest.update(BLOB msg)
+-----------------------------
 
-Incrementally add the BLOB to the digest context of this object.
-Returns ``true`` if and only if the operation was successful.
+Incrementally add the BLOB ``msg`` to the digest context of this
+object.  Returns ``true`` if and only if the operation was successful.
 
 As described above: if a digest object is updated in ``vcl_init``,
 then the updated context is valid for all subsequent uses of the
@@ -280,9 +280,9 @@ task (client or backend transaction).
 This method MAY NOT be called after ``.final()`` has been called
 for the same object, either in ``vcl_init`` or in the current task.
 
-The method fails and returns ``false`` if the BLOB is NULL, or if it
-is called after ``.final()``. If it fails in ``vcl_init``, the VCL
-load will fail with an error message. If it fails in any other VCL
+The method fails and returns ``false`` if ``msg`` is NULL, or if it is
+called after ``.final()``. If it fails in ``vcl_init``, the VCL load
+will fail with an error message. If it fails in any other VCL
 subroutine, an error message is emitted to the Varnish log with the
 ``VCL_Error`` tag, and the message digest context is unchanged.
 

src/vmod_blobdigest.vcc

@@ -14,7 +14,7 @@ $ABI vrt
 ::
 
   new OBJECT = blobdigest.digest(ENUM hash [, BLOB init], ["TASK"|"TOP"])
-  BOOL <obj>.update(BLOB)
+  BOOL <obj>.update(BLOB msg)
   BLOB <obj>.final()
 
   BLOB blobdigest.hash(ENUM hash, BLOB msg)
@@ -223,10 +223,10 @@ Example::
       new sha512 = blobdigest.digest(SHA512, foo.get());
   }
 
-$Method BOOL .update(BLOB)
+$Method BOOL .update(BLOB msg)
 
-Incrementally add the BLOB to the digest context of this object.
-Returns ``true`` if and only if the operation was successful.
+Incrementally add the BLOB ``msg`` to the digest context of this
+object.  Returns ``true`` if and only if the operation was successful.
 
 As described above: if a digest object is updated in ``vcl_init``,
 then the updated context is valid for all subsequent uses of the
@@ -236,9 +236,9 @@ task (client or backend transaction).
 This method MAY NOT be called after ``.final()`` has been called
 for the same object, either in ``vcl_init`` or in the current task.
 
-The method fails and returns ``false`` if the BLOB is NULL, or if it
-is called after ``.final()``. If it fails in ``vcl_init``, the VCL
-load will fail with an error message. If it fails in any other VCL
+The method fails and returns ``false`` if ``msg`` is NULL, or if it is
+called after ``.final()``. If it fails in ``vcl_init``, the VCL load
+will fail with an error message. If it fails in any other VCL
 subroutine, an error message is emitted to the Varnish log with the
 ``VCL_Error`` tag, and the message digest context is unchanged.