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MINOR: [Python][Docs] Improved grammatical error at line 33 (#13526)

Improved grammar in line 33.

Before: "Here will we detail..."
Change: "Here we will detail..."

Authored-by: Mathias Michael <mathiasmike01@gmail.com>
Signed-off-by: Alenka Frim <frim.alenka@gmail.com>