api: fix reviews/ links
On potential changes (including extensions) of the API/ABI please check following list:
- [ ] [use case](/doc/usecases) for API exists
-- [ ] API design [review](/doc/api_review/) template is created by author of API change
+- [ ] API design [review](reviews/) template is created by author of API change
- [ ] **Before** starting to implement the change: [decisions](/doc/decisions) for API is in step `decided`
- [ ] **After** implementing the change: [decisions](/doc/decisions) for API is in step `implemented`
-- [ ] API design is [reviewed](/doc/api_review/) by someone else, too
+- [ ] API design is [reviewed](reviews/) by someone else, too
- [ ] full Doxygen docu (all parameters, full design-by-contract, brief, long, examples, etc.)
- [ ] full Testcoverage
- [ ] still ABI/API forward-compatible
