Moved Face-data-migration.md updates to docs

Author: pospielov

Face-data-migration.md

@@ -2,36 +2,43 @@
 
 ## When do you need to migrate data
 
-When you upload a new known image to the Face Collection, 
-CompreFace uses a neural network model to calculate an embedding (also known as face features), 
-which is basically an array of 512 or 128 numbers. 
-Then CompreFace saves it to the database to use in the future comparison - when you upload a face to recognize, 
-CompreFace again calculates an embedding and compares it to saved embeddings.
-
-The important thing here is that every neural network model will calculate different embeddings. 
-It means that it makes sense to compare embeddings calculated by the same neural network model.
-
-CompreFace doesn't change the neural network model during its work, so normally you don’t need to migrate your face data. 
-If you want to try [custom build](Custom-builds.md), be very careful - look at the table [here](../custom-builds/README.md), 
-column `Face recognition model` - if the model changed, you need to run a migration.
+When you upload a new known image to the Face Collection, CompreFace
+uses a neural network model to calculate an embedding (also known as
+face features), which is an array of 512 or 128 numbers. Then CompreFace
+saves it to the database to use in the future comparison - when you
+upload a face to recognize, CompreFace again calculates an embedding and
+compares it to saved embeddings.
+
+The important thing here is that every neural network model calculates
+different embeddings. Therefore, it means that it makes sense to compare
+embeddings calculated by the same neural network model.
+
+CompreFace doesn't change the neural network model during its work, so
+you usually don't need to migrate your face data. If you want to try
+[custom build](Custom-builds.md), be very careful - look at the table
+[here](../custom-builds/README.md), column `Face recognition model` - if
+the model changed, you need to run a migration.
 
 ## Limitations
 
-If you run CompreFace in the [“not saving images to database” mode](Configuration.md)(`save_images_to_db=false`), 
-you won’t be able to migrate data as the original images are required for migration.
+If you run CompreFace in the ["not saving images to database"
+mode](Configuration.md)(`save_images_to_db=false`), you won't be
+able to migrate data as the original images are required for migration.
 
-The only solution here is to delete all images from Face Collection and upload them again.
+The only solution here is to delete all images from Face Collection and
+upload them again.
 
 ## How to perform a migration
 
-Current migration was written for internal usage and wasn’t tested enough, so please do a backup copy of the database and perform migration at your own risk.
+Current migration was written for internal usage and wasn't tested
+enough, so please do a backup copy of the database and perform migration
+at your own risk.
 
 REST request to start migration:
 
-```shell
-curl -i -X POST \
-'http://localhost:8000/api/v1/migrate'
-```
+    curl -i -X POST \
+    'http://localhost:8000/api/v1/migrate'
 
-This rest endpoint is asynchronous, it will start the migration and return a response immediately. 
-To understand if the migration is successful, please look at logs for “Migration successfully finished” text.
+This rest endpoint is asynchronous; it starts the migration and returns
+a response immediately. Please look at logs for "Migration successfully
+finished" text to understand if the migration is successful.