Updated tutorials

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diff --git a/tutorials/module_1/functions.md b/tutorials/module_1/functions.md
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@@ -5,6 +5,7 @@ Like a traditional mathematical functions, python functions can take an input, p
 Functions are defined by using the <code> def </code> keyword. Reminder: it is important to keep track of indentations as it signifies the end of the function when the indentation returns back to the same level.
 
 ## Defining Functions
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 ### Simple function
 A simple function with no input variable can be useful if you need to re-use code multiple times without having to re-write it.
 
@@ -22,6 +23,7 @@ We can pass variables through to the function to be processed as follows:
 ```
 
 Note input variables can be of any data type (integer, float, string, etc.).
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 ### Returning values from a function
 If we want to calculate a value and pass it back to the script for further use, we can use the `return` keyword. Let's define a linear function that takes two inputs, `x` and `b`, computes the corresponding `y` value, and returns it so it can be used elsewhere in the code.
 
@@ -32,6 +34,7 @@ If we want to calculate a value and pass it back to the script for further use,
 ```
 
 For multiple output variables we can add 
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 ## Calling functions
 Now that we've covered defining functions we want to call the function in order to execute the block inside the function. To do this, we simply re-call the function name as follows.