doc: fix modulecmd state check in recipe code

Code to handle the internal states of modulecmd have been reworked on
Modules v4.6. As a consequence several siteconfig.tcl extension scripts
described on documentation recipes have to be adapted.

Closes #396

doc/example/log-module-commands/siteconfig.tcl

@@ -13,7 +13,7 @@
 # override 'module' procedure to log each call made by user
 rename ::module ::__module
 proc module {command args} {
-   if {[getEvalModuleStackDepth] == 0} {
+   if {[depthState modulename] == 0} {
       exec logger -t module "[get-env USER]: $command [join $args]"
    }
    return [eval __module "{$command}" $args]

doc/example/top-priority-values/siteconfig.tcl

@@ -40,7 +40,7 @@ proc setenv {args} {
 
    if {$topPriority} {
       # define an helper variable to know a top-priority value has been set
-      if {[currentMode] ne "display"} {
+      if {[currentState mode] ne "display"} {
          __setenv MODULES_PRIORITY_$var $val
       }
       __setenv $var $val
@@ -77,7 +77,7 @@ proc setenv-un {args} {
 
    if {$topPriority} {
       # define an helper variable to know a top-priority value has been set
-      if {[currentMode] ne "display"} {
+      if {[currentState mode] ne "display"} {
          __setenv-un MODULES_PRIORITY_$var $val
       }
       __setenv-un $var $val