MINOR: [Java] Modify document error description

[caicancai]

Rationale for this change

No need to execute cd java

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[lidavidm]

I think it helps to imply which directory you should be in. Maybe we can replace it with an explicit "From the java/ subdirectory" or similar?

[caicancai]

I think it helps to imply which directory you should be in. Maybe we can replace it with an explicit "From the java/ subdirectory" or similar?

thanks, how about cd java/gandiva

[caicancai]

@lidavidm I am working on Calcite integrating Arrow with Calcite. Thank you for your excellent work on Arrow.

[lidavidm]

Hi @caicancai sorry for the delay. Glad to hear you are working on the Calcite integration!

I think it helps to imply which directory you should be in. Maybe we can replace it with an explicit "From the java/ subdirectory" or similar?

thanks, how about cd java/gandiva

Shouldn't it be just java? Maven should be invoked from the root