DOC: How to surppress exceptions/warnings/log messages (#1037)

docs/index.rst

@@ -20,6 +20,7 @@ You can contribute to `PyPDF2 on Github <https://github.com/py-pdf/PyPDF2>`_.
 
    user/installation
    user/robustness
+   user/suppress-warnings
    user/metadata
    user/extract-text
    user/encryption-decryption

docs/user/suppress-warnings.md

@@ -0,0 +1,75 @@
+# Suppress Warnings and Log messages
+
+PyPDF2 makes use of 3 mechanisms to show that something went wrong:
+
+* **Exceptions**: Error-cases the client should explicitly handle. In the
+   `strict=True` mode, most log messages will become exceptions. This can be
+   useful in applications where you can force to user to fix the broken PDF.
+* **Warnings**: Avoidable issues, such as using deprecated classes / functions / parameters
+* **Log messages**: Nothing the client can do, but they should know it happened.
+
+
+## Exceptions
+
+Exeptions need to be catched if you want to handle them. For example, you could
+want to read the text from a PDF as a part of a search function.
+
+Most PDF files don't follow the specifications. In this case PyPDF2 needs to
+guess which kinds of mistakes were potentially done when the PDF file was created.
+See [the robustness page](robustness.md) for the related issues.
+
+As a users, you likely don't care about it. If it's readable in any way, you
+want the text. You might use pdfminer.six as a fallback and do this:
+
+```python
+from PyPDF2 import PdfReader
+from pdfminer.high_level import extract_text as fallback_text_extraction
+
+text = ""
+try:
+    reader = PdfReader("example.pdf")
+    for page in reader.pages:
+        text += page.extract_text()
+except Exception as exc:
+    text = fallback_text_extraction("example.pdf")
+```
+
+You could also capture [`PyPDF2.errors.PyPdfError`](https://github.com/py-pdf/PyPDF2/blob/main/PyPDF2/errors.py)
+if you prefer something more specific.
+
+## Warnings
+
+The [`warnings` module](https://docs.python.org/3/library/warnings.html) allows
+you to ignore warnings:
+
+```python
+import warnings
+
+warnings.filterwarnings("ignore")
+```
+
+In many cases, you actually want to start Python with the `-W` flag so that you
+see all warnings. This is especially true for Continuous Integration (CI).
+
+## Log messages
+
+Log messages can be noisy in some cases. PyPDF2 hopefully is having a reasonable
+level of log messages, but you can reduce which types of messages you want to
+see:
+
+```python
+import logging
+
+logger = logging.getLogger("PyPDF2")
+logger.setLevel(logging.ERROR)
+```
+
+The [`logging` module](https://docs.python.org/3/library/logging.html#logging-levels)
+defines six log levels:
+
+* CRITICAL
+* ERROR
+* WARNING
+* INFO
+* DEBUG
+* NOTSET