DOC: Small changes to PaperSize notes

Plus one typo in xmp.py.
py-pdf · Sep 6, 2024 · b9ef7fd · b9ef7fd
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commit b9ef7fd
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diff --git a/pypdf/papersizes.py b/pypdf/papersizes.py
@@ -21,6 +21,7 @@ class PaperSize:
     # So the height of the next bigger one is the width of the smaller one
     # The ratio is always approximately 1:2**0.5
     # Additionally, A0 is defined to have an area of 1 m**2
+    # https://en.wikipedia.org/wiki/ISO_216
     # Be aware of rounding issues!
     A0 = Dimensions(2384, 3370)  # 841mm x 1189mm
     A1 = Dimensions(1684, 2384)