docs: clarify parser and rules interactions

Author: pvdlg

README.md

@@ -8,7 +8,7 @@ Customizable commit-analyzer plugin for [semantic-release](https://github.com/se
 
 ## Options
 
-By default `commit-analyzer` uses the `angular` format described in [Angular convention](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-angular/convention.md) and the [default rules](lib/default-release-rules.js) for release.
+By default `commit-analyzer` uses the `angular` format described in [Angular convention](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-angular) and the [default rules](lib/default-release-rules.js) for release.
 
 Additional options can be set within the plugin definition in `package.json` to use a different commit format and to customize it:
 
@@ -41,6 +41,8 @@ Additional options can be set within the plugin definition in `package.json` to
 
 ### Release Rules
 
+Release rules are used when deciding if the commits since the last release warrant a new release. If you define custom release rules the default rules will be used if nothing matched. Those rules will be matched against the commit objects resulting of [conventional-commits-parser](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-commits-parser) parsing.
+
 Release rules are used when deciding if the commits since the last release warrant a new release. If you define custom release rules the [default rules](lib/default-release-rules.js) will be used if nothing matched.
 
 #### Rules definition
@@ -152,7 +154,8 @@ module.exports = [
 
 Allow to overwrite specific [conventional-commits-parser](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-commits-parser#conventionalcommitsparseroptions) options. This is convenient to use a [conventional-changelog](https://github.com/conventional-changelog/conventional-changelog) preset with some customizations without having to create a new module.
 
-The following example uses [Angular convention](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-angular/convention.md) but will consider a commit to be a breaking change if it's body contains `BREAKING CHANGE`, `BREAKING CHANGES` or `BREAKING`. By default the [preset](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-angular/index.js#L14) checks only for `BREAKING CHANGE` and `BREAKING CHANGES`.
+The following example uses [Angular convention](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-angular/convention.md) but will consider a commit to be a breaking change if [conventional-commits-parser](https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-commits-parser) detects a valid `BREAKING CHANGE`, `BREAKING CHANGES` or `BREAKING` section in the commit body. By default the [preset](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-angular/index.js#L14) checks only for `BREAKING CHANGE` and `BREAKING CHANGES`.
+
 ```json
 {
   "release": {