Update documentation to reflect refactored parse_standalone_function_call implementation

[Copilot]

The documentation in docs/source/internals/parser.rst shows an outdated implementation of parse_standalone_function_call() with inline argument parsing logic. The actual implementation was refactored to delegate to the shared parse_function_call_args() helper function.

Changes

• Update code example in parser documentation (lines 1132-1175) to match current implementation that uses parse_function_call_args() instead of inline argument parsing

Current documented implementation (outdated):

static ASTNode* parse_standalone_function_call(FILE *input, const char *function_name)
{
    // ... inline argument parsing with while loop ...
    consume(input, TOKEN_SEMICOLON);
}

Actual implementation (needs to be documented):

static ASTNode* parse_standalone_function_call(FILE *input, const char *function_name)
{
    func_call_node = parse_function_call_args(input, function_name);
    consume(input, TOKEN_SEMICOLON);
}

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