Update how-to-open-a-file.rst

Clarify that "open" is an alias of class Document. Addresses issue #3636.
pymupdf · Jun 29, 2024 · e8121b2 · e8121b2
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diff --git a/docs/how-to-open-a-file.rst b/docs/how-to-open-a-file.rst
@@ -32,6 +32,8 @@ To open a file, do the following:
     doc = pymupdf.open("a.pdf")
 
 
+.. note:: The above creates a :ref:`Document`. The instruction `doc = pymupdf.Document("a.pdf")` does exactly the same. So, `open` is just a convenient alias  and you can find its full API documented in that chapter. 
+
 
 Opening with :index:`a Wrong File Extension <pair: wrong; file extension>`
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