FreeBSD/doc f7b64f8 (r52900)en_US.ISO8859-1/books/porters-handbook/special chapter.xml

Porter's Handbook: Document CARGO_USE_GITLAB

- Remove mention of CARGO_GH_CARGOTOML after ports r496795
- Update CARGO_USE_GITHUB description.  It does not patch Cargo.lock.
  That is done automatically during the configure phase by cargo
  itself and is not worth mentioning here.

Approved by:    mat
Differential Revision:  https://reviews.freebsd.org/D19697
DeltaFile
+9-11en_US.ISO8859-1/books/porters-handbook/special/chapter.xml
+9-111 files

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