Fix wrong punctuation for arguments in curl commands (#9359) (#11847)

* Fix wrong punctuation for arguments in curl commands

Removed the redundant symbol " carried in the curl parameter in the example. In the original example, this will cause the id of the sourcemap managed by kibana to have more escape characters when uploading by referring to the example, which will cause the sourcemap to map to the error stack and cannot work. For example The correct id should be "apm-foo-1.0-xxx", the original example would result in an id of "apm:\"demo\"-\"1.0\-xxx"".
This issue is mentioned in [sourcemap to error stack doesn't work](elastic/apm-agent-rum-js#1289)

* fixed: js.map to js

-F 'bundle_filepath=/test/e2e/general-usecase/bundle.js.map' -> -F 'bundle_filepath=/test/e2e/general-usecase/app.min.js'
- fixed: js.map to js
- fixed: change filename, in actual project development, js and js.map often have the same name except for the suffix name. Such examples will help readers to understand better.

Co-authored-by: Silvia Mitter <[email protected]>
(cherry picked from commit 5af0d4c)

Co-authored-by: LHB6540 <[email protected]>

docs/source-map-how-to.asciidoc

@@ -124,10 +124,10 @@ curl -X POST "http://localhost:5601/api/apm/sourcemaps" \
 -H 'Content-Type: multipart/form-data' \
 -H 'kbn-xsrf: true' \
 -H 'Authorization: ApiKey ${YOUR_API_KEY}' \ <2>
--F 'service_name="foo"' \
--F 'service_version="$SERVICEVERSION"' \
--F 'bundle_filepath="/test/e2e/general-usecase/bundle.js.map"' \
--F 'sourcemap="@./dist/app.min.js.map"'
+-F 'service_name=foo' \
+-F 'service_version=$SERVICEVERSION' \
+-F 'bundle_filepath=/test/e2e/general-usecase/app.min.js' \
+-F 'sourcemap=@./dist/app.min.js.map'
 ----
 <1> This example uses the version from `package.json`
 <2> The API key used here needs to have appropriate {kibana-ref}/rum-sourcemap-api.html[privileges]