Fix comment error and grammarly

src/bin/hexyl.rs

@@ -209,7 +209,7 @@ fn run() -> Result<()> {
                 .short('e')
                 .action(ArgAction::SetTrue)
                 .help(
-                    "Print out the data in little endian format. Otherwise the data will be showed \
+                    "Print out the data in little endian format. Otherwise the data will be shown \
                     in big endian format by default.",
                 ),
         );

src/lib.rs

@@ -267,7 +267,7 @@ pub struct Printer<'a, Writer: Write> {
     group_size: u8,
     /// The number of digits used to write the base.
     base_digits: u8,
-    /// Whether to print the bytes in little endian
+    /// Whether to show groups in little or big endian ordering.
     endianness: Endianness,
 }