DOC: Minor readability increases (#2515)

1. Sort the API reference, de-emphasizing the deprecated PdfMerger.
2. Add new lines to .pre-commit-config.yaml.

Author: j-t-1

.pre-commit-config.yaml

@@ -17,27 +17,32 @@ repos:
         exclude: "docs/make.bat"
     -   id: check-added-large-files
         args: ['--maxkb=1000']
+
 -   repo: https://github.com/psf/black
     rev: 23.3.0
     hooks:
     -   id: black
         args: [--target-version, py37]
+
 -   repo: https://github.com/asottile/blacken-docs
     rev: 1.14.0
     hooks:
     -   id: blacken-docs
         additional_dependencies: [black==22.1.0]
         exclude: "docs/user/robustness.md"
+
 -   repo: https://github.com/charliermarsh/ruff-pre-commit
     rev: v0.1.9
     hooks:
     -   id: ruff
         args: ['--fix']
+
 -   repo: https://github.com/asottile/pyupgrade
     rev: v3.3.2
     hooks:
     -   id: pyupgrade
         args: [--py37-plus]
+
 -   repo: https://github.com/pycqa/flake8
     rev: 5.0.4
     hooks:

docs/index.rst

@@ -49,18 +49,18 @@ You can contribute to `pypdf on GitHub <https://github.com/py-pdf/pypdf>`_.
 
    modules/PdfReader
    modules/PdfWriter
-   modules/PdfMerger
-   modules/PageObject
-   modules/Transformation
-   modules/DocumentInformation
-   modules/XmpInformation
    modules/Destination
-   modules/RectangleObject
+   modules/DocumentInformation
    modules/Field
-   modules/PageRange
-   modules/annotations
    modules/Fit
+   modules/PageObject
+   modules/PageRange
    modules/PaperSize
+   modules/PdfMerger
+   modules/RectangleObject
+   modules/Transformation
+   modules/XmpInformation
+   modules/annotations
    modules/constants
    modules/errors
    modules/generic