Proposal : Update Anime 10-shuunen da yo! Chibi Maruko-chan source

Proposal details

This proposal will make the following change(s):

Update the source of the anime 10-shuunen da yo! Chibi Maruko-chan

Change the source from Unknown to Manga

Based on the following reason: Missing

With the source: https://myanimelist.net/anime/51271/10-shuunen_da_yo_Chibi_Maruko-chan?q=10-shuunen%20da%20yo!%20Chibi%20Maruko-chan&cat=anime