Updated LangSmith setup instructions #3933
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Added additional environment variables for LangSmith configuration.
Summary
Adds missing
LANGCHAIN_PROJECTandLANGCHAIN_CALLBACKS_BACKGROUNDenvironment variables to the LangSmith documentation table, along with a note explaining the "default" project behavior.Changes
LANGCHAIN_PROJECTenv var (optional, default:default)LANGCHAIN_CALLBACKS_BACKGROUNDenv var (optional, default:true)Fixes
#3908