Add guidance on avoiding "there is", "there are"

[julian-cable]

Guidance to add:
Avoid "there is" and "there are", because the subject of the sentence is unclear.

Original example 1:
"The initial error message suggests there is a failure when opening a file."

Improvement example 1:
"The initial error message suggests a failure when opening a file."

Original example 2:
"There are multiple static inventory formats supported by Ansible."

Improvement example 2:
"Ansible supports multiple static inventory formats."

[julian-cable]

Added guidance and examples.