Update sparse_rw.py

[aviswaroop]

Greetings, Please find below a list of minor changes in the code's documented comments.

• Line 40: replace 'Clculate' with 'Calculate
• Line 65: replace 'finidng' with 'finding
• Line 67: replace 'according' with 'corresponding'
• Line 146: replace 'is' with 'are'
• Line 147: replace 'find' with 'finds'
• Line 237: replace 'is' with 'are'
• Line 238: replace 'Unlinke' with 'Unlike'

Thank You