Correct sentences

[christianbraeunlich]

🦦 There were some unapplied suggestions from @JesperSchulz in the merged pr https://github.com/microsoft/alguidelines/pull/142

• https://github.com/microsoft/alguidelines/pull/142#discussion_r824610286 => https://github.com/microsoft/alguidelines/commit/bb587c5d0990567395e845db062fa7ea27b436b1
• https://github.com/microsoft/alguidelines/pull/142#discussion_r824610748 => https://github.com/microsoft/alguidelines/commit/42358aab34506f91a1a582624fd713ff550f81a5