Fixed clippy and rust docs problem

Author: xuganyu96

src/uint/boxed/encoding.rs

@@ -132,7 +132,7 @@ impl BoxedUint {
         out.into()
     }
 
-    /// Create a new [`Uint`] from the provided big endian hex string.
+    /// Create a new [`BoxedUint`] from the provided big endian hex string.
     pub fn from_be_hex(hex: &str, bits_precision: u32) -> Self {
         let nlimbs = (bits_precision / Limb::BITS) as usize;
         let bytes = hex.as_bytes();

src/uint/boxed/shl.rs

@@ -122,11 +122,12 @@ impl BoxedUint {
         let mut result = Self::zero_with_precision(self.bits_precision());
         let success = self.shl_vartime_into(&mut result, shift);
         // TODO: is this okay?
-        return (
+
+        (
             result,
             // If success, then return ConstChoice::False since it's not overflowing
             success.map_or(ConstChoice::TRUE, |_| ConstChoice::FALSE),
-        );
+        )
     }
 
     /// Computes `self << 1` in constant-time.

src/uint/boxed/shr.rs

@@ -126,11 +126,11 @@ impl BoxedUint {
         let mut result = Self::zero_with_precision(self.bits_precision());
         let success = self.shr_vartime_into(&mut result, shift);
         // TODO: is this okay?
-        return (
+        (
             result,
             // If success, then return ConstChoice::False since it's not overflowing
             success.map_or(ConstChoice::TRUE, |_| ConstChoice::FALSE),
-        );
+        )
     }
 
     /// Computes `self >> 1` in constant-time, returning a true [`Choice`]