Remove unwanted slash in the generation of the message link #6362

Job	Run time
Build docs	34s
Examples	2m 26s
Check minimal versions	33s
Check (builder without model)	25s
Check (temp cache + typesize)	35s
Check (unstable + typesize)	31s
Test (native-tls)	43s
Test (macOS)	40s
Test (beta)	43s
Check (unstable (no default features))	18s
Check (temp cache)	20s
Test (no default features)	33s
Test (Windows)	3m 2s
Test (zlib and zstd compression)	58s
Test (no cache)	1m 2s
Test (nightly)	40s
Test (stable)	56s
Test (chrono)	35s
Test (zlib compression)	1m 3s
Test (no gateway)	58s
MSRV	0s
Test (zstd compression)	40s
	18m 15s

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