com php-langspec: Mention generated files + pre-commit hook in CONTRIBUTING: CONTRIBUTING.md

Commit:    b0e2ca93602b649d936295a0fceaec5381b64101=0AAuthor:    Nikita Pop=
ov <[email protected]>         Tue, 26 Sep 2017 10:59:40 +0200=0AParents=
:   7741beb3af80779a223bc61ef0d4d7a31bf12f50=0ABranches:  master=0A=0ALink:=
       http://git.php.net/?p=3Dphp-langspec.git;a=3Dcommitdiff;h=3Db0e2ca93=
602b649d936295a0fceaec5381b64101=0A=0ALog:=0AMention generated files + pre-=
commit hook in CONTRIBUTING=0A=0AChanged paths:=0A  M  CONTRIBUTING.md=0A=
=0A=0ADiff:=0Adiff --git a/CONTRIBUTING.md b/CONTRIBUTING.md=0Aindex 0b6090=
1..681fd4b 100644=0A--- a/CONTRIBUTING.md=0A+++ b/CONTRIBUTING.md=0A@@ -1,8=
 +1,24 @@=0A ## Contributing to the Specification for PHP=0A =0A We'd love =
your help in improving, correcting, adding to the specification.=0A-Please =
[file an issue](https://bugs.php.net/) or [submit a pull request](https://w=
iki.php.net/vcs/gitworkflow)=0A-at the [spec git repo](https://github.com/p=
hp/php-langspec).=0A+Please [file an issue](https://github.com/php/php-lang=
spec/issues)=0A+or [submit a pull request](https://github.com/php/php-langs=
pec/pulls).=0A+=0A+## Generated content=0A+=0A+The grammar listings and tab=
le of contents of the specification are automatically=0A+generated. If you =
want to change the grammar, you need to modify the respective=0A+`<!--GRAMM=
AR` block and run `tools/grammar.php` to regenerate the rendered listings.=
=0A+If you add or change headings, you need to regenerate the TOC using `to=
ols/toc.php`.=0A+Additionally `tools/check_refs.php` can be run to verify t=
hat all cross-references=0A+are valid.=0A+=0A+To combine these three steps =
you can instead execute `tools/pre-commit`. To=0A+automatically run it on e=
very commit, create a symlink in the `.git/hooks` directory:=0A+=0A+```sh=
=0A+ln -s -f ../../tools/pre-commit .git/hooks/pre-commit=0A+```=0A =0A ## =
License for your Contributions=0A