Add note about stream closure

src/main/java/com/keenwrite/io/StreamMediaType.java

		/**
		* Convenience method to return the probed media type for the given
		- * {@link InputStream} instance.
		+ * {@link InputStream} instance. The caller is responsible for closing
		+ * the stream.
		*
		* @param is Data source to ascertain the {@link MediaType}.

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