Omit duplicate text.

Clarify the explanation of the compat_time.c definition of time.

Elaborate documentation of libc symbol rules.

- Say `provide' for what libc does to a symbol.
- Say `define' for what source code does to a symbol or macro.
- Quote code fragments rather than just t

Elaborate documentation of libc symbol rules.

- Say `provide' for what libc does to a symbol.
- Say `define' for what source code does to a symbol or macro.
- Quote code fragments rather than just talking about them.
- Qualify ELF symbols as such.
- List provided ELF symbols in tables rather than in prose.

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Add section headings. Match order in table of contents.

Tweak wording.

Elaborate on how our ad-hack symbol versioning works. Tweak style.

First draft of documentation for the libc symbol madness.

Currently describes only what we do, not why we do it.