MINOR: Correcting reviewers script for names

[apoorvmittal10]

The reviewers.py script incorrectly parses reviewer names that start
with characters appearing in "Author:" or "Reviewers:", leading to
truncated names.

Issue

stripped = line.strip().lstrip("Reviewers: ").lstrip("Author: ")

The Problem: lstrip(string) does not remove a prefix string. Instead, it
removes any characters from that character set from the left side of the
string.

Fix

Replace the buggy lstrip() calls with proper prefix removal. Two options
available:

Option 1: Using removeprefix() (Python 3.9+)

stripped = line.strip().removeprefix("Reviewers:
").removeprefix("Author: ")

Requires Python 3.9+

Option 2: Using startswith() (Python 3.0+)

Used option 2 as the script currently supports Python 3+

Example Issue:
When searching for "Apoorv", the script showed:

• poorv Mittal apoorvmittal10@gmail.com ❌ - Missing the "A"
• Apoorv Mittal apoorvmittal10@gmail.com ✅ - Correct