Fix MDX syntax errors by adding required frontmatter - #4

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Failed to parse frontMatter content at path Learn/Basics/Case-Study/Case-3-Automatic-Expansion-and-Collection-on-Long-Load-More-Lists.mdx: can not read a block mapping entry; a multiline key may not be an implicit key at line 3, column 13:
    sidebarTitle: "Case3: Load More & Infinite S ... 
                ^
Failed to parse frontMatter content at path Learn/Basics/Node-Types/Pagination-Node.mdx: can not read a block mapping entry; a multiline key may not be an implicit key at line 4, column 1:
    
    ^
Failed to parse frontMatter content at path Learn/Basics/Node-Types/Tab-Operation-Node.mdx: can not read a block mapping entry; a multiline key may not be an implicit key at line 4, column 1:
    
    ^
Failed to parse frontMatter content at path Learn/Quick-Start/Build-Your-First-Data-Scraper-Workflow-in-5-Minutes.mdx: can not read a block mapping entry; a multiline key may not be an implicit key at line 4, column 1:
    
    ^
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