Add some description for (malloc/calloc/free/realloc)
Add some description for (malloc/calloc/free/realloc)

graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust