Fix small typos

[makenowjust]

I found these typos with using typos-cli.

Now, we can obtain no typo reports from the typos command with this configuration (.typos.toml):

[files]
extend-exclude = [
  "*.svg",
  "*.xml",
]

[default.extend-words]
# Common variable names in this project.
arry = "arry"
blok = "blok"
eles = "eles"
# Incomplete words in test data.
caf = "caf"
# German words in test data.
abl = "abl" # NOTE: It is a part of "Ablüfe".
alle = "alle"
ist = "ist"
technik = "technik"

Thank you.

[olleolleolle]

@makenowjust Thanks!