Fix for: Misleading pattern examples in documentation for additional_file_patterns (#222)

When trying to follow examples in documentation for `additional_file_patterns` to annotate [Blueprinter's](https://github.com/procore-oss/blueprinter) blueprints (serializers), which are located in `app/blueprints` directory - nothing happens. Blueprints are not picked up as additional files for annotating with `additional_file_patterns` set as `app/blueprints/%model_name%_blueprint.rb`.

### Documentation example in question
```
Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%model_name%/*.rb,/baz/%model_name%.rb`)
```
which does not work, because `model_name` is expected to be upper case `MODEL_NAME`.

### What does work
```
:additional_file_patterns:
- app/blueprints/%MODEL_NAME%_blueprint.rb
```

### Solution

Examples in documentation should reflect that `MODEL_NAME` in `additional_file_patterns` is expected to be upper case.

Author: skliarov

MIGRATION_GUIDE.md

@@ -56,7 +56,7 @@ Command options:
 Additional options that work for annotating models and routes
 
         --additional-file-patterns path1,path2,path3
-                                     Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%model_name%/*.rb,/baz/%model_name%.rb`)
+                                     Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%MODEL_NAME%/*.rb,/baz/%MODEL_NAME%.rb`)
     -d, --delete                     Remove annotations from all model files or the routes.rb file
         --model-dir dir              Annotate model files stored in dir rather than app/models, separate multiple dirs with commas
         --root-dir dir               Annotate files stored within root dir projects, separate multiple dirs with commas
@@ -122,4 +122,3 @@ When running the install generator command, `bin/rails g annotate_rb:install`, a
 It _should_ match the old Annotate defaults however there may be differences.
 
 **Note: there were bugs in Annotate that may have led to options not actually being used for some of the `exclude_*` options. If you experience different behavior despite using the same defaults then this may be why.**
-

README.md

@@ -149,7 +149,7 @@ Command options:
 Additional options that work for annotating models and routes
 
         --additional-file-patterns path1,path2,path3
-                                     Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%model_name%/*.rb,/baz/%model_name%.rb`)
+                                     Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%MODEL_NAME%/*.rb,/baz/%MODEL_NAME%.rb`)
     -d, --delete                     Remove annotations from all model files or the routes.rb file
         --model-dir dir              Annotate model files stored in dir rather than app/models, separate multiple dirs with commas
         --root-dir dir               Annotate files stored within root dir projects, separate multiple dirs with commas

lib/annotate_rb/parser.rb

@@ -362,7 +362,7 @@ def add_options_to_parser(option_parser) # rubocop:disable Metrics/MethodLength
 
       option_parser.on("--additional-file-patterns path1,path2,path3",
         Array,
-        "Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%model_name%/*.rb,/baz/%model_name%.rb`)") do |additional_file_patterns|
+        "Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%MODEL_NAME%/*.rb,/baz/%MODEL_NAME%.rb`)") do |additional_file_patterns|
         @options[:additional_file_patterns] = additional_file_patterns
       end