chore(docs): add missing documentation

[luisschwab]

Closes #109.

This PR adds the missing documentation and a CI job that checks that all objects are documented.

[coveralls]

Pull Request Test Coverage Report for Build 20112427727

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.654%

---

Totals
Change from base Build 20087828871:	0.0%
Covered Lines:	1387
Relevant Lines:	1530

---

💛 - Coveralls

[ValuedMammal]

utACK c302998

Comments are mostly nits.

[ValuedMammal]

Suggested change

	/// The output index of the [`TxOut`] in the [`Transaction`] that created the it.
	/// The output index of the [`TxOut`] in the [`Transaction`] that created it.

[ValuedMammal]

Suggested change

	/// A summary of [`Transaction`]s which an [`Address`] was involved.
	/// A summary of [`Transaction`]s in which an [`Address`] was involved.

[ValuedMammal]

Suggested change

	/// Information about the [`Transaction`] that created this [`TxOut`].
	/// Information about the [`Transaction`] that spent this [`TxOut`].

[ValuedMammal]

Suggested change

	/// The Merkle root of the [`Block`]'s [`Transaction`]'s.
	/// The Merkle root of the [`Block`]'s [`Transaction`]s.

[ValuedMammal]

For clarity I would try to avoid using input and output in the same sentence. "this" should always refer to an instance of the type we're talking about.

 /// Information about an input from a [`Transaction`].
 #[derive(Deserialize, Clone, Debug, PartialEq, Eq)]
 pub struct Vin {
-    /// The [`Txid`] of the [`Transaction`] that created this [`TxOut`].
+    /// The [`Txid`] of the previous [`Transaction`] this input spends from.
     pub txid: Txid,
     /// The output index of the previous output in the [`Transaction`] that created it.
     pub vout: u32,
-    /// Information about this [`TxOut`]'s amount and ScriptPubKey.
-    /// `None` if this is a coinbase output.
+    /// The previous output amount and ScriptPubKey. `None` if this is a coinbase
+    /// input.
     pub prevout: Option<PrevOut>,
-    /// The ScriptSig that allows spending this [`TxOut`].
+    /// The ScriptSig that authorizes spending this input.
     pub scriptsig: ScriptBuf,
-    /// The Witness that allows spending this [`TxOut`], if this is a SegWit output.
+    /// The Witness that authorizes spending this input, if this is a SegWit spend.
     #[serde(deserialize_with = "deserialize_witness", default)]
     pub witness: Vec<Vec<u8>>,
     /// The sequence value for this input, used to set RBF and Locktime behavior.
     pub sequence: u32,
-    /// Whether this input is a coinbase output.
+    /// Whether this is a coinbase input.
     pub is_coinbase: bool,
 }