main/busybox: fix empty -doc

Closed TBK requested to merge TBK/aports:main/busybox into master

Resolves #11443 (closed)

The man page in the busybox-doc package seems to be empty.

$ apk info -L busybox-doc
busybox-doc-1.31.1-r14 contains:

$ zcat /usr/share/man/man1/busybox.1.gz

/bin/sh: pod2text: not found
  DOC     busybox.1
make[2]: [/home/buildozer/aports/main/busybox/src/busybox-1.31.1/Makefile.custom:159: docs/BusyBox.txt] Error 127 (ignored)
/bin/sh: pod2man: not found
make[2]: [/home/buildozer/aports/main/busybox/src/busybox-1.31.1/Makefile.custom:164: docs/busybox.1] Error 127 (ignored)
/bin/sh: pod2html: not found
make[2]: [/home/buildozer/aports/main/busybox/src/busybox-1.31.1/Makefile.custom:174: docs/] Error 127 (ignored)
Edited by TBK

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