Replace usage of implementsApis with relations

.changeset/fifty-nails-pay.md

@@ -0,0 +1,6 @@
+---
+'@backstage/plugin-api-docs': patch
+'@backstage/plugin-catalog': patch
+---
+
+Replace usage of implementsApis with relations

.changeset/short-singers-serve.md

@@ -4,7 +4,7 @@
 
 Marked the field `spec.implementsApis` on `Component` entities for deprecation on Dec 14th, 2020.
 
-Code that consumes these fields should remove those usages as soon as possible as migrate to using
+Code that consumes these fields should remove those usages as soon as possible and migrate to using
 relations instead. Producers should fill the field `spec.providesApis` instead, which has the same
 semantic.