Fix export_generator shell script on Linux

[fujigon]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

./bin/utils/export_docs_generators.sh (and its depending ./bin/utils/export_generators.sh) has string pattern bug.

[fujigon]

re-run ./bin/utils/export_docs_generators.sh and committed all docs/generators/*.md

[fujigon]

@wing328 @jimschubert @cbornet @jaz-ah @ackintosh @JFCote @jmini

[wing328]

@fujigon thanks for the PR. Reviewing...

[wing328]

@fujigon I tried to trigger a build failure via 8d82fc6 but the build still passed: https://circleci.com/gh/OpenAPITools/openapi-generator/2853. Still investigating why...

[wing328]

I've a fix and https://circleci.com/gh/OpenAPITools/openapi-generator/2870#tests/containers/2 reported failure, which is the expected behaviour.

[wing328]

@fujigon I've pushed the fix to your branch and the circle CI build is good (shippable failure is not related to this PR). Merging this into master. Thanks again for the fix.

cc @jmini

[jimschubert]

@wing328 @fujigon I was reviewing this, but I couldn't understand how the change in this PR had any difference in sh, since the markdown outputs resulted in the same generator name outputs (only difference was the added generator properties). I think the bash syntax could be cleaned up a little more, but I wanted to understand the error that was being solved. Was the problem perhaps a sed portability issue?

I was testing on the sed shipped with Mac 10.13.6.

[jimschubert]

Sorry, I missed the on Linux in the PR title. I opened another PR to move the work being done in sed and output redirection into the config-help task itself.

[fujigon]

thanks for the review and merging!
I confirmed that ./bin/utils/ensure-up-to-date has no git diff about docs on Linux with current master.

[wing328]

@fujigon thanks for the fix, which has been included in the v3.3.1 release: https://twitter.com/oas_generator/status/1052020299821080577