R: Formatted article's reference section links (#19853)
* R: Formatted reference section links * Update index.md
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						 Kristofer Koishigawa
						Kristofer Koishigawa
					
				
			
			
				
	
			
			
			
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			| @@ -39,6 +39,6 @@ Second, a name cannot use some special symbols, like  `^,  !,  $,  @,  +,  -,  / | |||||||
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| ## References | ## References | ||||||
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| <a href='https://cran.r-project.org/manuals.html' target='_blank' rel='nofollow'>Official Docs</a> |  * [Official Docs](https://cran.r-project.org/manuals.html) | ||||||
| <a href='https://www.r-bloggers.com/classes-and-objects-in-r/' target='_blank' rel='nofollow'>Objects in R by r-bloggers</a> |  * [Objects in R by r-bloggers](https://www.r-bloggers.com/classes-and-objects-in-r/) | ||||||
| <a href='https://cran.r-project.org/doc/manuals/r-release/R-lang.html' target='_blank' rel='nofollow'>CRAN</a> |  * [CRAN](https://cran.r-project.org/doc/manuals/r-release/R-lang.html) | ||||||
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