#2739 Enhance documentation around SPI usage

documentation/src/main/asciidoc/chapter-13-using-mapstruct-spi.asciidoc

@@ -1,7 +1,18 @@
 [[using-spi]]
 == Using the MapStruct SPI
+
+To use a custom SPI implementation, it must be located in a separate JAR file together with a file named after the SPI (e.g. `org.mapstruct.ap.spi.AccessorNamingStrategy`) in `META-INF/services/` with the fully qualified name of your custom implementation as content (e.g. `org.mapstruct.example.CustomAccessorNamingStrategy`). This JAR file needs to be added to the annotation processor classpath (i.e. add it next to the place where you added the mapstruct-processor jar).
+
+
+[NOTE]
+====
+It might also be necessary to add the jar to your IDE's annotation processor factory path. Otherwise you might get an error stating that it cannot be found, while a run using your build tool does succeed.
+====
+
 === Custom Accessor Naming Strategy
 
+SPI name: `org.mapstruct.ap.spi.AccessorNamingStrategy`
+
 MapStruct offers the possibility to override the `AccessorNamingStrategy` via the Service Provider Interface (SPI). A nice example is the use of the fluent API on the source object `GolfPlayer` and `GolfPlayerDto` below.
 
 .Source object GolfPlayer with fluent API.
@@ -121,14 +132,14 @@ public class CustomAccessorNamingStrategy extends DefaultAccessorNamingStrategy
 ====
 The `CustomAccessorNamingStrategy` makes use of the `DefaultAccessorNamingStrategy` (also available in mapstruct-processor) and relies on that class to leave most of the default behaviour unchanged.
 
-To use a custom SPI implementation, it must be located in a separate JAR file together with the file `META-INF/services/org.mapstruct.ap.spi.AccessorNamingStrategy` with the fully qualified name of your custom implementation as content (e.g. `org.mapstruct.example.CustomAccessorNamingStrategy`). This JAR file needs to be added to the annotation processor classpath (i.e. add it next to the place where you added the mapstruct-processor jar).
-
 [TIP]
 Fore more details: The example above is present in our examples repository (https://github.com/mapstruct/mapstruct-examples).
 
-[mapping-exclusion-provider]
+[[mapping-exclusion-provider]]
 === Mapping Exclusion Provider
 
+SPI name: `org.mapstruct.ap.spi.MappingExclusionProvider`
+
 MapStruct offers the possibility to override the `MappingExclusionProvider` via the Service Provider Interface (SPI).
 A nice example is to not allow MapStruct to create an automatic sub-mapping for a certain type,
 i.e. MapStruct will not try to generate an automatic sub-mapping method for an excluded type.
@@ -177,16 +188,12 @@ include::{processor-ap-test}/nestedbeans/exclusions/custom/CustomMappingExclusio
 ----
 ====
 
-To use a custom SPI implementation, it must be located in a separate JAR file
-together with the file `META-INF/services/org.mapstruct.ap.spi.MappingExclusionProvider` with the fully qualified name of your custom implementation as content
-(e.g. `org.mapstruct.example.CustomMappingExclusionProvider`).
-This JAR file needs to be added to the annotation processor classpath
-(i.e. add it next to the place where you added the mapstruct-processor jar).
-
 
 [[custom-builder-provider]]
 === Custom Builder Provider
 
+SPI name: org.mapstruct.ap.spi.BuilderProvider
+
 MapStruct offers the possibility to override the `DefaultProvider` via the Service Provider Interface (SPI).
 A nice example is to provide support for a custom builder strategy.
 
@@ -202,6 +209,8 @@ include::{processor-ap-main}/spi/NoOpBuilderProvider.java[tag=documentation]
 [[custom-enum-naming-strategy]]
 === Custom Enum Naming Strategy
 
+SPI name: `org.mapstruct.ap.spi.EnumMappingStrategy`
+
 MapStruct offers the possibility to override the `EnumMappingStrategy` via the Service Provider Interface (SPI).
 This can be used when you have certain enums that follow some conventions within your organization.
 For example all enums which implement an interface named `CustomEnumMarker` are prefixed with `CUSTOM_`
@@ -349,6 +358,8 @@ public class CheeseTypeMapperImpl implements CheeseTypeMapper {
 [[custom-enum-transformation-strategy]]
 === Custom Enum Transformation Strategy
 
+SPI name: `org.mapstruct.ap.spi.EnumTransformationStrategy`
+
 MapStruct offers the possibility to other transformations strategies by implementing `EnumTransformationStrategy` via the Service Provider Interface (SPI).
 A nice example is to provide support for a custom transformation strategy.