Update minimum requirements (#17064)
Closes #17063
Summary of the issue:
NVDA's User Guide specifies a too low amount of minimal disk space for NVDA.
Description of user facing changes
In the User Guide, update minimum required disk space to 200 MB.
While at it, updated the wording for lines above.
Description of development approach
I have chosen the next round value above. But we may use a higher value if needed. E.g.:
250 MB for a higher round value giving more room to future inclusions
300 MB, using a strategy according to which we would double the required value when the previously required value is exceeded.
