zcash_address: Move ZcashAddress::convert into root

Using two separate `impl ZcashAddress` blocks resulted in separate
blocks in the documentation, which is unnecessary.

components/zcash_address/src/convert.rs

@@ -1,6 +1,6 @@
 use std::{error::Error, fmt};
 
-use crate::{kind::*, AddressKind, Network, ZcashAddress};
+use crate::{kind::*, Network};
 
 /// An address type is not supported for conversion.
 #[derive(Debug)]
@@ -14,20 +14,10 @@ impl fmt::Display for UnsupportedAddress {
 
 impl Error for UnsupportedAddress {}
 
-impl ZcashAddress {
-    pub fn convert<T: FromAddress>(self) -> Result<T, UnsupportedAddress> {
-        match self.kind {
-            AddressKind::Sprout(data) => T::from_sprout(self.net, data),
-            AddressKind::Sapling(data) => T::from_sapling(self.net, data),
-            AddressKind::Orchard(data) => T::from_orchard(self.net, data),
-            AddressKind::P2pkh(data) => T::from_transparent_p2pkh(self.net, data),
-            AddressKind::P2sh(data) => T::from_transparent_p2sh(self.net, data),
-        }
-    }
-}
-
 /// A helper trait for converting a [`ZcashAddress`] into another type.
 ///
+/// [`ZcashAddress`]: crate::ZcashAddress
+///
 /// # Examples
 ///
 /// ```

components/zcash_address/src/lib.rs

@@ -70,4 +70,14 @@ impl ZcashAddress {
     pub fn try_from_encoded(s: &str) -> Result<Self, ParseError> {
         s.parse()
     }
+
+    pub fn convert<T: FromAddress>(self) -> Result<T, UnsupportedAddress> {
+        match self.kind {
+            AddressKind::Sprout(data) => T::from_sprout(self.net, data),
+            AddressKind::Sapling(data) => T::from_sapling(self.net, data),
+            AddressKind::Orchard(data) => T::from_orchard(self.net, data),
+            AddressKind::P2pkh(data) => T::from_transparent_p2pkh(self.net, data),
+            AddressKind::P2sh(data) => T::from_transparent_p2sh(self.net, data),
+        }
+    }
 }