fix stray / in URLs (#356) #924

Job	Run time
Docs	2m 24s
Checks	1m 59s
Compile and test (2.12.19, 8)	3m 37s
Compile Benchmarks	1m 22s
Compile and test (2.12.19, 11)	3m 51s
Gradle tests	3m 11s
Compile and test (2.12.19, 17)	3m 42s
Maven tests	2m 47s
Compile and test (2.12.19, 21)	3m 20s
sbt scripted tests (gen-scala-server, 2.12)	7m 49s
Compile and test (2.13.14, 8)	4m 24s
sbt scripted tests (gen-java, 2.12)	3m 33s
Compile and test (2.13.14, 11)	4m 14s
Compile and test (2.13.14, 17)	4m 1s
Compile and test (2.13.14, 21)	4m 10s
Compile and test (3.3.3, 8)	4m 44s
Compile and test (3.3.3, 11)	4m 7s
Compile and test (3.3.3, 17)	4m 8s
Compile and test (3.3.3, 21)	3m 50s
	1h 11m 13s

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