chore(docs) remove unneeded eval_rst statements

docs/others/fragment.md

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 # Fragment
 

docs/others/gridnav.md

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 # Grid navigation
 
 Grid navigation (gridnav for short) is a feature that changes the currently focused child object as arrow keys are pressed.

docs/others/imgfont.md

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 ## Image font (imgfont)
 Draw image in label or span obj with imgfont.
 This is often used to display Unicode emoji icons in text.

docs/others/index.md

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 # Others
 
 

docs/others/monkey.md

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 # Monkey
 
 A simple monkey test. Use random input to stress test the application.

docs/others/msg.md

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 # Messaging
 
 Messaging (`lv_msg`) is a classic []publisher subscriber](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern) implementation for LVGL.

docs/others/snapshot.md

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 # Snapshot
 
 Snapshot provides APIs to take snapshot image for LVGL object together with its children. The image will look exactly like the object.