Update String Formatting.md
Update String Formatting.md

Added solution to the Spanish version
ubear/interactive-tutorials,daftano/interactive-tutorials,like9729/interactive-tutorials,like9729/interactive-tutorials,GenericSnake/interactive-tutorials,GenericSnake/interactive-tutorials,daftano/interactive-tutorials,like9729/interactive-tutorials,daftano/interactive-tutorials,like9729/interactive-tutorials,ronreiter/interactive-tutorials,daftano/interactive-tutorials,revzim/interactive-tutorials,revzim/interactive-tutorials,ronreiter/interactive-tutorials,ubear/interactive-tutorials,revzim/interactive-tutorials,ubear/interactive-tutorials,ubear/interactive-tutorials,revzim/interactive-tutorials,ronreiter/interactive-tutorials,GenericSnake/interactive-tutorials