docs(all): move information to preprocessors section (#2279)

Author: kanoru3101

docs/@v1/configuration/reference/preprocessors.md

@@ -2,7 +2,11 @@
 
 ## Introduction
 
-Preprocessors are similar to decorators, but they run before linting rather than after.
+Preprocessors are similar to decorators and follow the same structure and operation, but they run before the validation/linting step rather than after.
+
+Running before the validation/linting step makes them brittle because the document may not be valid, and the extra processing step can cause performance impacts. We recommend looking for alternative approaches to preprocessing.
+
+Some advanced use cases do require preprocessing, which is why the functionality is provided for those users.
 
 Refer to the [`decorator` configuration options](./decorators.md) documentation for details; the options available are the same in both the `decorators` and `preprocessor` sections of the configuration file.
 

docs/@v1/custom-plugins/custom-decorators.md

@@ -218,6 +218,4 @@ decorators:
 
 ## Preprocessors
 
-Preprocessors follow the same structure and operation as decorators, but they are run before the validation/linting step. Running before the validation/linting step makes them brittle because the document may not be valid, and the extra processing step can cause performance impacts. We recommend looking for alternative approaches to preprocessing.
-
-Some advanced use cases do require preprocessing, which is why the functionality is provided for those users.
+For detailed information about preprocessors, see the [preprocessors configuration reference](../configuration/reference/preprocessors.md).

docs/@v2/configuration/reference/preprocessors.md

@@ -2,7 +2,11 @@
 
 ## Introduction
 
-Preprocessors are similar to decorators, but they run before linting rather than after.
+Preprocessors are similar to decorators and follow the same structure and operation, but they run before the validation/linting step rather than after.
+
+Running before the validation/linting step makes them brittle because the document may not be valid, and the extra processing step can cause performance impacts. We recommend looking for alternative approaches to preprocessing.
+
+Some advanced use cases do require preprocessing, which is why the functionality is provided for those users.
 
 Refer to the [`decorator` configuration options](./decorators.md) documentation for details; the options available are the same in both the `decorators` and `preprocessor` sections of the configuration file.
 

docs/@v2/custom-plugins/custom-decorators.md

@@ -213,6 +213,4 @@ decorators:
 
 ## Preprocessors
 
-Preprocessors follow the same structure and operation as decorators, but they are run before the validation/linting step. Running before the validation/linting step makes them brittle because the document may not be valid, and the extra processing step can cause performance impacts. We recommend looking for alternative approaches to preprocessing.
-
-Some advanced use cases do require preprocessing, which is why the functionality is provided for those users.
+For detailed information about preprocessors, see the [preprocessors configuration reference](../configuration/reference/preprocessors.md).