Fix typos in known issues documentation

[HASSAAN-AMIN]

First Edit :

• "effort" is singular so use has not have

Second Edit :

• we use "an" before vowel sounds (an old )

Third Edit :

• use Sometimes because sometimes means occasionally and Some times means some period or era

Fourth Edit :

• Plural of ISO is ISOs not ISO's

• This fix issue:

PR Description:

Tests and Checks

• I have tested the code!