Fix caution block overflow

Author: a-bahdanau

docs/develop/func/stdlib.mdx

@@ -508,7 +508,7 @@ The pseudo-random number generator uses the random seed, an unsigned 256-bit Int
 Keep in mind that random numbers generated by the functions below can be predicted if you do not use additional tricks.
 
 - [Random number generation](/develop/smart-contracts/guidelines/random-number-generation)
-  :::
+:::
 
 #### random