Typos on notebook day "Python Basics" w/ corrections

[SylvainLapoix]

• "Markdown relies on characters, in particular the star (or multiply)."* : "or multiply" ? Or "multiple" maybe ?
• "reserved keyword" : to define
• "naming arguments" : not mandatory
• "indexing starts at zero" : to stress
• "appended" : to define ?
• in dictionary exercice 2 : why initiate the variable "sum_elts" ?
• "This can be remedied by using an additional software library)" : lost "("
• "array" : to define
• "The main types are int32 (32-bit integers), int64 (64-bit integers), float32 (32-bit real values) and float64 (64-bit real values)." : a little technical