Update, expand, and document plugin tutorial 2

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diff --git a/doc/plugin_tutorial/tuto2/theories/Demo.v b/doc/plugin_tutorial/tuto2/theories/Demo.v
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+From Tuto2 Require Import Loader.
+
+(*** A no-op command ***)
+
+Nothing.
+
+(*** No-op commands with arguments ***)
+
+(*
+ * Terminal parameters:
+ *)
+Command With Some Terminal Parameters.
+(* Command. *) (* does not parse *)
+
+(*
+ * A single non-terminal argument:
+ *)
+Pass 42.
+(* Pass. *) (* does not parse *)
+(* Pass True. *) (* does not parse *)
+(* Pass 15 20. *) (* does not parse *)
+
+(*
+ * A list of non-terminal arguments:
+ *)
+Accept 100 200 300 400.
+Accept.
+Accept 2.
+
+(*
+ * A custom argument:
+ *)
+Foobar Foo.
+Foobar Bar.
+
+(*** Commands that give feedback ***)
+
+(*
+ * Simple feedback:
+ *)
+Is Everything Awesome.
+
+(*** Storage and side effects ***)
+
+(*
+ * Local side effects:
+ *)
+Count.
+Count.
+Count.
+(*
+ * See Count.v for behavior in modules that import this one.
+ *)
+
+(*
+ * Persistent side effects:
+ *)
+Count Persistent.
+Count Persistent.
+Count Persistent.
+(*
+ * See Count.v for behavior in modules that import this one.
+ *)