STY: Move is_encrypted below __init__ in PdfWriter (#2659)

Plus tiny documentation changes

pypdf/_reader.py

@@ -164,7 +164,7 @@ def _info(self) -> Optional[DictionaryObject]:
         Provide access to "/Info". standardized with PdfWriter.
 
         Returns:
-            /Info Dictionary ; None if the entry does not exists
+            /Info Dictionary; None if the entry does not exist
         """
         info = self.trailer.get(TK.INFO, None)
         if info is None:
@@ -183,7 +183,7 @@ def _ID(self) -> Optional[ArrayObject]:
         Provide access to "/ID". standardized with PdfWriter.
 
         Returns:
-            /ID array ; None if the entry does not exists
+            /ID array; None if the entry does not exist
         """
         id = self.trailer.get(TK.ID, None)
         return None if id is None else cast(ArrayObject, id.get_object())

pypdf/_writer.py

@@ -154,17 +154,6 @@ class PdfWriter(PdfDocCommon):
     Typically data is added from a :class:`PdfReader<pypdf.PdfReader>`.
     """
 
-    # for commonality
-    @property
-    def is_encrypted(self) -> bool:
-        """
-        Read-only boolean property showing whether this PDF file is encrypted.
-
-        Note that this property, if true, will remain true even after the
-        :meth:`decrypt()<pypdf.PdfReader.decrypt>` method is called.
-        """
-        return False
-
     def __init__(
         self,
         fileobj: Union[None, PdfReader, StrByteType, Path] = "",
@@ -252,6 +241,17 @@ def _get_clone_from(
         self._encrypt_entry: Optional[DictionaryObject] = None
         self._ID: Union[ArrayObject, None] = None
 
+    # for commonality
+    @property
+    def is_encrypted(self) -> bool:
+        """
+        Read-only boolean property showing whether this PDF file is encrypted.
+
+        Note that this property, if true, will remain true even after the
+        :meth:`decrypt()<pypdf.PdfReader.decrypt>` method is called.
+        """
+        return False
+
     @property
     def root_object(self) -> DictionaryObject:
         """
@@ -2471,7 +2471,7 @@ def merge(
             elif isinstance(dest["/Page"], NullObject):
                 pass
             elif isinstance(dest["/Page"], int):
-                # the page reference is a page number normally not iaw Pdf Reference
+                # the page reference is a page number normally not a PDF Reference
                 # page numbers as int are normally accepted only in external goto
                 p = reader.pages[dest["/Page"]]
                 assert p.indirect_reference is not None