Fix the docs for ReadHandle.read's "count"

This was copied over from the old binary handle, and so states we
always return a single number if no count is given. This is only the
case when the file is opened in binary mode.

projects/common/src/main/java/dan200/computercraft/data/PrettyDataProvider.java

@@ -32,7 +32,7 @@ public record PrettyDataProvider<T extends DataProvider>(T provider) implements
     }
 
     private record Output(CachedOutput output) implements CachedOutput {
-        @SuppressWarnings("unused")
+        @SuppressWarnings("deprecation")
         private static final HashFunction HASH_FUNCTION = Hashing.sha1();
 
         @Override

projects/core/src/main/java/dan200/computercraft/core/apis/handles/AbstractHandle.java

@@ -100,8 +100,8 @@ public abstract class AbstractHandle {
     /**
      * Read a number of bytes from this file.
      *
-     * @param countArg The number of bytes to read. When absent, a single byte will be read <em>as a number</em>. This
-     *                 may be 0 to determine we are at the end of the file.
+     * @param countArg The number of bytes to read. This may be 0 to determine we are at the end of the file. When
+     *                 absent, a single byte will be read.
      * @return The read bytes.
      * @throws LuaException When trying to read a negative number of bytes.
      * @throws LuaException If the file has been closed.