doc auto-update

src/vmod_constant.rst

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 .. NB:  This file is machine generated, DO NOT EDIT!
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-.. Edit vmod.vcc and run make instead
+.. Edit ./vmod_constant.vcc and run make instead
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@@ -183,8 +183,8 @@ will be undefined.
 
 .. _xbackend.get():
 
-BACKEND xbackend.get(BACKEND fallback=0)
-----------------------------------------
+BACKEND xbackend.get(BACKEND fallback=NULL)
+-------------------------------------------
 
 Return the value of the constant or the `fallback` argument
 if it is undefined. The default fallback is no backend.

src/vmod_globalvar.rst

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 .. NB:  This file is machine generated, DO NOT EDIT!
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-.. Edit vmod.vcc and run make instead
+.. Edit ./vmod_globalvar.vcc and run make instead
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@@ -265,8 +265,8 @@ will be initially undefined.
 
 .. _xbackend.get():
 
-BACKEND xbackend.get(BACKEND fallback=0)
-----------------------------------------
+BACKEND xbackend.get(BACKEND fallback=NULL)
+-------------------------------------------
 
 Return the value of the globalvar or the `fallback` argument
 if it is undefined. The default fallback is no backend.

src/vmod_taskvar.rst

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 .. NB:  This file is machine generated, DO NOT EDIT!
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-.. Edit vmod.vcc and run make instead
+.. Edit ./vmod_taskvar.vcc and run make instead
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@@ -359,8 +359,8 @@ will be initially undefined.
 
 .. _xbackend.get():
 
-BACKEND xbackend.get(BACKEND fallback=0)
-----------------------------------------
+BACKEND xbackend.get(BACKEND fallback=NULL)
+-------------------------------------------
 
 Return the value of the taskvar or the `fallback` argument
 if it is undefined. The default fallback is no backend.

src/vmod_topvar.rst

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 .. NB:  This file is machine generated, DO NOT EDIT!
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-.. Edit vmod.vcc and run make instead
+.. Edit ./vmod_topvar.vcc and run make instead
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@@ -342,8 +342,8 @@ will be initially undefined.
 
 .. _xbackend.get():
 
-BACKEND xbackend.get(BACKEND fallback=0)
-----------------------------------------
+BACKEND xbackend.get(BACKEND fallback=NULL)
+-------------------------------------------
 
 Return the value of the topvar or the `fallback` argument
 if it is undefined. The default fallback is no backend.