Some small typos in 050_Models.ipynb

[wanxinyang]

In the notebook 050_Models.ipynb, some typos might cause confusion and would be better to update:

Prerequisties section:

• np/mgrid -> np.mgrid
• "You should by know be familiar" -> "You should now be familiar"

Models section:

• the last line above the first code cell: "This has two parameters p[0] and p[0]" -> the second p[0] might be p[1]

Discrepancy and optimisation section:

• "The best approach with depend on circumstances" -> "The best approach will depend on circumstances"

[wanxinyang]

In notebook 051_Phenology_model.ipynb, there is also a small typo:

In the help document of the function simple_dbl_sigmoid_function(sp,p, t), “”p2 is 2 parameters: width and centre“ -> "sp is 2 parameters: width and centre“.

[profLewis]

done.