[NFC][analyzer] Document the VirtualCall checkers (#131861) This commit documents `cplusplus.PureVirtualCall` (which was previously completely undocumented) and improves the documentation of `optin.cplusplus.VirtualCall` (which was very barebones). Note that in this documentation I do not mention the checker options of `optin.cplusplus.VirtualCall`, because `ShowFixIts` is apparently in an unfinished alpha state (since 2019 when it was added by commit 6cee434ed10ead6b7416ca5ee9592b2b207eeb0f) and `PureOnly` is a deprecated option that I'm going to remove very soon.
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