Fix(docs): correct multiple typos in pdf_parsing_for_semantic_retrieval_systems.ipynb

[Rahul-Lashkari]

Description of the change

Corrects several minor typos and grammatical errors within site/en/docs/pdf_parsing_for_semantic_retrieval_systems.ipynb.

Examples include fixing misspellings (e.g., Structred, successfuly, descibe, deontes) and improving clarity (e.g., iter comment, matches grammar).

Motivation

To improve the readability and overall quality of the documentation notebook.

Type of change

Documentation

Checklist

• [x] I have performed a self-review of my code.
• [x] I have added detailed comments to my code where applicable.
• [x] I have verified that my change does not break existing code.
• [x] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [x] I am familiar with the Google Style Guide for the language I have coded in.
• [x] I have read through the Contributing Guide and signed the Contributor License Agreement.