Merge branch 'build-release' into 'main'

Fix links and paths in release build instuctions

See merge request !130

docs/athena/developers/building.md

@@ -55,7 +55,7 @@ out of the appropriate version of the
 [atlasexternals](https://gitlab.cern.ch/atlas/atlasexternals) repository
 according to
 [Projects/Athena/externals.txt]({{data.athena_git_url}}/blob/{{data.branchMainShort}}/Projects/Athena/externals.txt)),
-and [build.sh]({{data.athena_git_url}}/tree/{{data.branchMainShort}}/Projects/Athena/build_externals.sh)
+and [build.sh]({{data.athena_git_url}}/tree/{{data.branchMainShort}}/Projects/Athena/build.sh)
 which builds Athena.
 
 The scripts come with extensive help messages (see `--help`) about their numerous command line options.
@@ -170,7 +170,7 @@ In order to use the above, in a fresh terminal you would do:
 
 ```sh
 setupATLAS
-asetup Athena,<VERSION> --releasepath=<YOURBUILDAREA> --siteroot=/cvmfs/atlas-nightlies.cern.ch/repo/sw/main_Athena_{{data.branchMainPlatform}}
+asetup Athena,<VERSION> --releasepath=<YOURBUILDAREA>/install --siteroot=/cvmfs/atlas-nightlies.cern.ch/repo/sw/main_Athena_{{data.branchMainPlatform}}
 ```
 
 If needed, you can help Athena find additional files that may be missing from
@@ -186,7 +186,7 @@ To run the unit tests, use the following environment setup:
 
 ```sh
 setupATLAS
-asetup Athena,<VERSION> --releasepath=<YOURBUILDAREA> --siteroot=/cvmfs/atlas-nightlies.cern.ch/repo/sw/main_Athena_{{data.branchMainPlatform}}
+asetup Athena,<VERSION> --releasepath=<YOURBUILDAREA>/install --siteroot=/cvmfs/atlas-nightlies.cern.ch/repo/sw/main_Athena_{{data.branchMainPlatform}}
 cd <YOURBUILDAREA>/build/Athena/
 ctest
 ```