documentation refers to missing README

[rillig]

docs/QuickStartGuide.txt says:

You should read docs/README.

see section 11 in docs/README

In September 2020, README has been removed. The reference should be updated.

life_pro_tips.txt says:

section #10 in README

section #2 in README

section #5 in README

status_screen.txt says:

See README

as discussed in the README

The documentation is great by the way, I almost managed to read it in a single go.

[rillig]

Another addition: when I stopped a slave, I got this:

[!] Stopped during the first cycle, results may be incomplete.
(For info on resuming, see .../share/doc/afl/README.)