DOC: Improve examples (#2612)

file-size.md: simplify examples
metadata.md: add two fields
suppress-warnings.md: small wording change

docs/user/file-size.md

@@ -35,13 +35,9 @@ reduction (from 5.7 MB to 0.8 MB) within a real PDF.
 
 
 ```python
-from pypdf import PdfReader, PdfWriter
-
-reader = PdfReader("example.pdf")
-writer = PdfWriter()
+from pypdf import PdfWriter
 
-for page in reader.pages:
-    writer.add_page(page)
+writer = PdfWriter(clone_from="example.pdf")
 
 writer.remove_images()
 
@@ -56,13 +52,9 @@ reduce the file size of the PDF overall. That depends on how well the reduced
 quality image can be compressed.
 
 ```python
-from pypdf import PdfReader, PdfWriter
-
-reader = PdfReader("example.pdf")
-writer = PdfWriter()
+from pypdf import PdfWriter
 
-for page in reader.pages:
-    writer.add_page(page)
+writer = PdfWriter(clone_from="example.pdf")
 
 for page in writer.pages:
     for img in page.images:

docs/user/metadata.md

@@ -12,11 +12,13 @@ meta = reader.metadata
 print(len(reader.pages))
 
 # All of the following could be None!
+print(meta.title)
 print(meta.author)
+print(meta.subject)
 print(meta.creator)
 print(meta.producer)
-print(meta.subject)
-print(meta.title)
+print(meta.creation_date)
+print(meta.modification_date)
 ```
 
 ## Writing metadata

docs/user/suppress-warnings.md

@@ -14,8 +14,8 @@ pypdf makes use of 3 mechanisms to show that something went wrong:
   "warning".
 * **Exceptions** are error-cases that pypdf users should explicitly handle.
   In the `strict=True` mode, most log messages with the warning level will
-  become exceptions. This can be useful in applications where you can force to
-  user to fix the broken PDF.
+  become exceptions. This can be useful in applications where you can require
+  a user to fix the broken PDF.
 
 
 ## Exceptions