[BUG FIX] Fix typos and redundant placeholder/value in bug report template

[yeezhouyi]

Description

Fixed 5 bugs in the bug report issue template (.github/ISSUE_TEMPLATE/1-bug-report.yml):

1. Typo: version numer → version number
2. Grammar: Make sure to attached → Make sure to attach (2 occurrences)
3. Typo: attachement.xml → attachment.xml (2 occurrences)
4. Redundant placeholder: Removed placeholder from "Steps to Reproduce" field (was identical to value, making it invisible)
5. Redundant placeholder: Removed placeholder from "Environment" field (same issue)

Related Issue

N/A (minor template fixes)

Motivation and Context

These bugs affect the quality of bug reports submitted by users. The typos look unprofessional, and the redundant placeholder fields are dead code since value pre-fills the textarea.

How Has This Been Tested

• Reviewed the YAML file for correctness
• Verified no remaining instances of the typos
• Confirmed placeholder + value redundancy is resolved

Checklist:

• I read the CONTRIBUTING document.
• I followed the Submitting Code Changes section of CONTRIBUTING document.
• I tagged the title correctly (including BUG FIX/FEATURE/MISC/BREAKING)
• I updated the documentation accordingly or no change is needed.
• I tested my changes and added instructions on how to test it for reviewers.