Add --printUnusedTemplates

Fixes #9502

docs/content/en/commands/hugo.md

@@ -53,6 +53,7 @@ hugo [flags]
       --printI18nWarnings          print missing translations
       --printMemoryUsage           print memory usage to screen at intervals
       --printPathWarnings          print warnings on duplicate target paths etc.
+      --printUnusedTemplates       print warnings on unused templates.
       --quiet                      build in quiet mode
       --renderToMemory             render to memory (only useful for benchmark testing)
   -s, --source string              filesystem path to read files relative from

docs/content/en/commands/hugo_mod.md

@@ -49,6 +49,7 @@ See https://gohugo.io/hugo-modules/ for more information.
       --printI18nWarnings      print missing translations
       --printMemoryUsage       print memory usage to screen at intervals
       --printPathWarnings      print warnings on duplicate target paths etc.
+      --printUnusedTemplates   print warnings on unused templates.
       --templateMetrics        display metrics about template executions
       --templateMetricsHints   calculate some improvement hints when combined with --templateMetrics
   -t, --theme strings          themes to use (located in /themes/THEMENAME/)

docs/content/en/commands/hugo_new.md

@@ -50,6 +50,7 @@ hugo new [path] [flags]
       --printI18nWarnings      print missing translations
       --printMemoryUsage       print memory usage to screen at intervals
       --printPathWarnings      print warnings on duplicate target paths etc.
+      --printUnusedTemplates   print warnings on unused templates.
       --templateMetrics        display metrics about template executions
       --templateMetricsHints   calculate some improvement hints when combined with --templateMetrics
   -t, --theme strings          themes to use (located in /themes/THEMENAME/)

docs/content/en/commands/hugo_server.md

@@ -63,6 +63,7 @@ hugo server [flags]
       --printI18nWarnings      print missing translations
       --printMemoryUsage       print memory usage to screen at intervals
       --printPathWarnings      print warnings on duplicate target paths etc.
+      --printUnusedTemplates   print warnings on unused templates.
       --renderToDisk           render to Destination path (default is render to memory & serve from there)
       --templateMetrics        display metrics about template executions
       --templateMetricsHints   calculate some improvement hints when combined with --templateMetrics