docs(spec-mini): document Commands and Calls syntax #2483
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Summary\n- Document XGo's command-style syntax for function/method calls\n- Explain both function-call style (with parentheses) and command-style (without parentheses)\n- Include grammar definition:
CommandStmt = IDENT [ \".\" IDENT ] SPACE LambdaExprList [ \"...\" ]\n- Provide examples of qualified and unqualified calls\n- Document variadic argument support with `...`\n- Clarify XGo's preference for command-style syntax\n\n## Changes\n- Replaced TODO at lines 1167-1172 in/workspace/doc/spec-mini.mdwith comprehensive documentation\n- Added subsections for function-call style and command-style syntax\n- Included code examples demonstrating both approaches\n- Explained that `echo` is an alias for `println` emphasizing command-oriented design\n\n## References\n- Grammar definition:doc/spec/mini/mini.xgo:119\n- Quick start documentation:doc/docs.md(lines 138-158)\n\n## Test plan\n- [x] Review documentation for accuracy\n- [x] Verify all code examples are valid XGo syntax\n- [x] Confirm alignment with quick start guide\n- [x] Check grammar definition matches implementation\n\n🤖 Generated with codeagent\nCo-authored-by: xushiwei [email protected]