go/printer: review formatting of multi-expression return statement

[griesemer]

This is a reminder issue following up on #7195 which fixed the existing formatting (CL 752220, CL 779921).
We should check that the change also works as desired if there's a mix of comp. literals and multi-line expressions in the return statement.

[gabyhelp]

Related Issues

• go/printer: match indentation when returning multiple composite literals #7195 (closed)
• go/printer: can print an invalid return statement depending on position info #32854 (closed)
• go/printer: odd layout of multiple return values that span lines #1207 (closed)

Related Code Changes

• go/printer: do not indent composite literals in return statements

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