Update catalan-numbers.md

deji725 · adamant-pwn · commit ab68c65c43ea · 2023-04-18T00:40:58.000+02:00
I wasn't sure why this article said "C++ Implementation Show/Hide". This PR here that I've edited allows for collapsible code sections (which I assume was the intention). 

However,I've seen other articles that don't have collapsible code sections so I wasn't quite sure if this was wanted here or not. Please let me know!
diff --git a/src/combinatorics/catalan-numbers.md b/src/combinatorics/catalan-numbers.md
@@ -47,7 +47,10 @@ You can also think it in this manner. By definition, $C_n$ denotes number of cor
 
 $( ) ( ( ) )$ can be divided into $( )$ and $( ( ) )$, but cannot be divided into $( ) ($ and $( ) )$. Again summing over all admissible $k's$, we get the recurrence relation on $C_n$.
 
-#### C++ implementation <span class="toggle-code">Show/Hide</span>
+#### C++ implementation 
+
+<details>
+<summary>Click here to show/hide code</summary>
 
 ```cpp
 const int MOD = ....
@@ -66,6 +69,7 @@ void init() {
     }
 }
 ```
+</details>
 
 ### Analytical formula
 

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,10 @@ You can also think it in this manner. By definition, $C_n$ denotes number of cor`
`47`	`47`
`48`	`48`	`$( ) ( ( ) )$ can be divided into $( )$ and $( ( ) )$, but cannot be divided into $( ) ($ and $( ) )$. Again summing over all admissible $k's$, we get the recurrence relation on $C_n$.`
`49`	`49`
`50`		`-#### C++ implementation <span class="toggle-code">Show/Hide</span>`
	`50`	`+#### C++ implementation`
	`51`	`+`
	`52`	`+<details>`
	`53`	`+<summary>Click here to show/hide code</summary>`
`51`	`54`
`52`	`55`	```cpp
`53`	`56`	`const int MOD = ....`
`@@ -66,6 +69,7 @@ void init() {`
`66`	`69`	`}`
`67`	`70`	`}`
`68`	`71`	```
	`72`	`+</details>`
`69`	`73`
`70`	`74`	`### Analytical formula`
`71`	`75`