more graceful docgen

[ajm188]

skip programs who either don't have a target directory (in content/en/.../) for that version, or don't have a docgen directory (go/cmd//docgen) in vitessio/vitess for that gitref

this allows us to freely bulk-generate docs for all programs/versions without having to get fussy about it

Example Output

(note i have upstream/main checked out as vmain so i tweaked the makefile locally)

``` ➜ vtwebsite git:(andrew/docgen-graceful) ✗ VITESS_DIR=~/dev/vitess make generated-docs go run ./tools/cobradocs/ --vitess-dir "/Users/andrew/dev/vitess" --version-pairs ""vmain:18.0,v17.0.2:17.0,v16.0.4:16.0,v15.0.4:15.0"" vtctld 2023/09/18 06:27:41 [warning] cannot find directory for doc version v17.0.2:17.0 (index=1): stat /Users/andrew/dev/vtwebsite/content/en/docs/17.0/reference/programs/vtctld: no such file or directory 2023/09/18 06:27:41 [warning] cannot find directory for doc version v16.0.4:16.0 (index=2): stat /Users/andrew/dev/vtwebsite/content/en/docs/16.0/reference/programs/vtctld: no such file or directory 2023/09/18 06:27:41 [warning] cannot find directory for doc version v15.0.4:15.0 (index=3): stat /Users/andrew/dev/vtwebsite/content/en/docs/15.0/reference/programs/vtctld: no such file or directory go run ./tools/cobradocs/ --vitess-dir "/Users/andrew/dev/vitess" --version-pairs ""vmain:18.0,v17.0.2:17.0,v16.0.4:16.0,v15.0.4:15.0"" vtctldclient go run ./tools/cobradocs/ --vitess-dir "/Users/andrew/dev/vitess" --version-pairs ""vmain:18.0,v17.0.2:17.0,v16.0.4:16.0,v15.0.4:15.0"" vtgate 2023/09/18 06:28:01 [warning] cannot find directory for doc version v17.0.2:17.0 (index=1): stat /Users/andrew/dev/vtwebsite/content/en/docs/17.0/reference/programs/vtgate: no such file or directory 2023/09/18 06:28:01 [warning] cannot find directory for doc version v16.0.4:16.0 (index=2): stat /Users/andrew/dev/vtwebsite/content/en/docs/16.0/reference/programs/vtgate: no such file or directory 2023/09/18 06:28:01 [warning] cannot find directory for doc version v15.0.4:15.0 (index=3): stat /Users/andrew/dev/vtwebsite/content/en/docs/15.0/reference/programs/vtgate: no such file or directory go run ./tools/cobradocs/ --vitess-dir "/Users/andrew/dev/vitess" --version-pairs ""vmain:18.0,v17.0.2:17.0,v16.0.4:16.0,v15.0.4:15.0"" vtorc 2023/09/18 06:28:04 [warning] cannot find directory for doc version v17.0.2:17.0 (index=1): stat /Users/andrew/dev/vtwebsite/content/en/docs/17.0/reference/programs/vtorc: no such file or directory 2023/09/18 06:28:04 [warning] cannot find directory for doc version v16.0.4:16.0 (index=2): stat /Users/andrew/dev/vtwebsite/content/en/docs/16.0/reference/programs/vtorc: no such file or directory 2023/09/18 06:28:04 [warning] cannot find directory for doc version v15.0.4:15.0 (index=3): stat /Users/andrew/dev/vtwebsite/content/en/docs/15.0/reference/programs/vtorc: no such file or directory go run ./tools/cobradocs/ --vitess-dir "/Users/andrew/dev/vitess" --version-pairs ""vmain:18.0,v17.0.2:17.0,v16.0.4:16.0,v15.0.4:15.0"" vttablet 2023/09/18 06:28:05 [warning] cannot find directory for doc version v17.0.2:17.0 (index=1): stat /Users/andrew/dev/vtwebsite/content/en/docs/17.0/reference/programs/vttablet: no such file or directory 2023/09/18 06:28:05 [warning] cannot find directory for doc version v16.0.4:16.0 (index=2): stat /Users/andrew/dev/vtwebsite/content/en/docs/16.0/reference/programs/vttablet: no such file or directory 2023/09/18 06:28:05 [warning] cannot find directory for doc version v15.0.4:15.0 (index=3): stat /Users/andrew/dev/vtwebsite/content/en/docs/15.0/reference/programs/vttablet: no such file or directory ➜ vtwebsite git:(andrew/docgen-graceful) ✗ echo $? 0 ```

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[ajm188]

tl;dr all the casing changes were made in the main codebase but never regenerated back to the website docs. this is just correcting that

i’ll defer to @rohit-nayak-ps for what consistency he wants there (i.e. i’d like to get the main change in and follow up for the consistentcy)