Fix links md files (HDFGroup#4239)

CONTRIBUTING.md

@@ -122,7 +122,7 @@ Please make sure that you check the items applicable to your pull request:
   * [ ] If changes were done to Autotools build, were they added to CMake and vice versa?
   * [ ] Is the pull request applicable to any other branches? If yes, which ones? Please document it in the GitHub issue.
   * [ ] Is the new code sufficiently documented for future maintenance?
-  * [ ] Does the new feature require a change to an existing API? See "API Compatibility Macros" document (https://portal.hdfgroup.org/display/HDF5/API+Compatibility+Macros)
+  * [ ] Does the new feature require a change to an existing API? See "API Compatibility Macros" document (https://docs.hdfgroup.org/hdf5/develop/api-compat-macros.html)
 * Documentation
   * [ ] Was the change described in the release_docs/RELEASE.txt file?
   * [ ] Was the new function documented in the corresponding public header file using [Doxygen](https://hdfgroup.github.io/hdf5/v1_14/_r_m_t.html)?

HDF5Examples/README.md

@@ -19,7 +19,7 @@ HELP AND SUPPORT
 ----------------
 Information regarding Help Desk and Support services is available at
 
-   https://portal.hdfgroup.org/display/support/The+HDF+Help+Desk
+   https://hdfgroup.atlassian.net/servicedesk/customer/portals
 
 
 
@@ -48,15 +48,15 @@ HDF5 SNAPSHOTS, PREVIOUS RELEASES AND SOURCE CODE
 --------------------------------------------
 Full Documentation and Programming Resources for this HDF5 can be found at
 
-   https://portal.hdfgroup.org/display/HDF5
+   https://portal.hdfgroup.org/documentation/index.html
 
 Periodically development code snapshots are provided at the following URL:
 
    https://gamma.hdfgroup.org/ftp/pub/outgoing/hdf5/snapshots/
 
 Source packages for current and previous releases are located at:
 
-   https://portal.hdfgroup.org/display/support/Downloads
+   https://portal.hdfgroup.org/downloads/
 
 Development code is available at our Github location:
 

test/API/README.md

@@ -1,7 +1,7 @@
 # HDF5 API Tests
 
 This directory contains several test applications that exercise HDF5's
-public API and serve as regression tests for HDF5 [VOL Connectors](https://portal.hdfgroup.org/display/HDF5/Virtual+Object+Layer).
+public API and serve as regression tests for HDF5 [VOL Connectors](https://docs.hdfgroup.org/hdf5/develop/_h5_v_l__u_g.html).
 
 ## Build Process and options