[fix](doc) avoid generate config doc automatically

[morningman]

Proposed changes

Issue Number: close #xxx

Problem summary

After #19246, when compilng FE, it will automatically generate Config and Session Variables doc and overwrite the origin one.
Need to avoid it because it is not ready to use yet

Checklist(Required)

• Does it affect the original behavior
• Has unit tests been added
• Has document been added or modified
• Does it need to update dependencies
• Is this PR support rollback (If NO, please explain WHY)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[morningman]

run buildall

[github-actions]

sh-checker report

To get the full details, please check in the job output.

shellcheck errors

'shellcheck ' found no issues.

shfmt errors

'shfmt ' returned error 1 finding the following formatting issues:

----------
--- build.sh.orig
+++ build.sh
@@ -512,7 +512,7 @@
         clean_fe
     fi
     if [[ "${DISABLE_JAVA_CHECK_STYLE}" = "ON" ]]; then
-        "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests -Dcheckstyle.skip=true 
+        "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests -Dcheckstyle.skip=true
     else
         "${MVN_CMD}" package -pl ${FE_MODULES:+${FE_MODULES}} -Dskip.doc=true -DskipTests
     fi
----------

You can reformat the above files to meet shfmt's requirements by typing:

  shfmt  -w filename

[morningman]

run buildall

[yiguolei]

LGTM