Update Screenshot Guidelines

[tomojira]

• Generally rewrote or reworded things related to external screenshot tools, RetroArch, internal resolution scaling, corrected/uncorrected aspect ratios, and matching screenshot sizes
• Finally fixed error about the total number of screenshots allowed
• Noted English fan translations are allowed
• Noted DS screenshots can be horizontal book-style
• Explained how Atari 2600 screenshots work
• Changed Wii widescreen guideline
• Added information on NES and an FCEUmm section
• Added information on Amstrad CPC and a Caprice32 section
• Added information on Apple II and an RAppleWin section
• Explained that screenshot dimensions section only includes 1x, but 2x/3x automatically work too
• Added more to resolution lists
• Added a screenshot of PCSX2 default Display settings, and fixed another screenshot to say PNG Quality 90% instead of 50%
• Added more information on PPSSPP screenshot mode

[greptile-apps]

Confidence Score: 5/5

Documentation-only PR adding new emulator sections, correcting factual claims, and expanding resolution lists — no risk to site functionality.

All changes are prose and images in a docs page. The factual corrections (screenshot count, CPC dimensions, SNES resolutions) appear intentional and consistent with the new emulator-specific guidance added in the same PR.

No files require special attention.

_{Reviews (2): Last reviewed commit: "Slight fix to image" | Re-trigger Greptile}