Bump sphinx-rtd-theme from 2.0.0 to 3.0.1 (#661)

* Bump sphinx-rtd-theme from 2.0.0 to 3.0.1

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 2.0.0 to 3.0.1.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](https://github.com/readthedocs/sphinx_rtd_theme/compare/2.0.0...3.0.1)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* remove call to get_html_theme_path

according to deprection warning of sphinx-rtd-theme>=3

* disable broken spelling integration (pypi) and fix spelling

* fix spelling

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Patrick Kanzler <dev@pkanzler.de>

src/escpos/printer/file.py

@@ -23,7 +23,7 @@ def is_usable() -> bool:
 class File(Escpos):
     """Generic file printer.
 
-    This class is used for parallel port printer or other printers that are directly attached to the filesystem.
+    This class is used for parallel port printer or other printers that are directly attached to the file system.
     Note that you should stay away from using USB-to-Parallel-Adapter since they are unreliable
     and produce arbitrary errors.
 
@@ -46,7 +46,7 @@ class File(Escpos):
     def __init__(self, devfile: str = "", auto_flush: bool = True, *args, **kwargs):
         """Initialize file printer with device file.
 
-        :param devfile: Device file under dev filesystem
+        :param devfile: Device file under dev file system
         :param auto_flush: automatically call flush after every call of _raw()
         """
         Escpos.__init__(self, *args, **kwargs)

src/escpos/printer/serial.py

@@ -89,7 +89,7 @@ class Serial(Escpos):
     ):
         """Initialize serial printer.
 
-        :param devfile:  Device file under dev filesystem
+        :param devfile:  Device file under dev file system
         :param baudrate: Baud rate for serial transmission
         :param bytesize: Serial buffer size
         :param timeout:  Read/Write timeout