docs(faqs): update documentation for disabling the cache

[majapavlo]

Documents the latest way to address these two issues:

• runtime cache #213
• How to remove and disable cache? #578

Please also note that the disable cache feature is not available on the latest version of the dspy package available on pypi. See: #805

[arnavsinghvi11]

Hi @majapavlo , does disabling the cache not work currently? Also just made a tweak to the phrasing since DSP_CACHEBOOL refers to the cache_turn_on flag.

[majapavlo]

The change you added might confuse users, since as a consumer of this library the cache_turn_on variable is a hidden implementation detail.
It should be possible to disable the cache without modifying the source code of the library, i.e. by setting an environment variable. This feature has already been added to the code, and is present on the main branch via the environment variable DSP_CACHEBOOL.

However, currently disabling the cache does not work, since the latest version of the package on pypi is missing this feature as the pypi releases are out of date. See this issue: #805.

[arnavsinghvi11]

I see, thanks for raising the concern @majapavlo . We have updated the README to mention how to use the library locally to use cache_turn_on as well.