Fix typo in code sample (#2063)

Author: wolfg1969

docs/en/modules/hmc5883l.md

@@ -20,7 +20,7 @@ temperature multiplied with 10 (integer)
 ```lua
 local sda, scl = 1, 2
 i2c.setup(0, sda, scl, i2c.SLOW) -- call i2c.setup() only once
-hmc58831.setup()
+hmc5883l.setup()
 local x,y,z = hmc5883l.read()
 print(string.format("x = %d, y = %d, z = %d", x, y, z))
 ```