Subject: 27.0.91; Correct manual entry for 'concat' w.r.t. allocation [PATCH]

From: Mattias Engdegård <[email-masked]>
Date: Thu, 9 Jul 2020 17:54:10 +0200

'concat' hasn't guaranteed the allocation of a new string since 1997 at least (79d137ffe7d). Remove claims to the contrary from the manual.