Copy edit intro

Author: seesharprun

articles/cosmos-db/mongodb/ru/introduction.md

@@ -17,7 +17,7 @@ ms.custom: ignite-2022
 
 [Azure Cosmos DB](../../introduction.md) is a fully managed NoSQL and relational database for modern app development.
 
-Azure Cosmos DB for MongoDB RU (Request Unit architecture) makes it easy to use Azure Cosmos DB as if it were a MongoDB database. You can use your existing MongoDB skills and continue to use your favorite MongoDB drivers, SDKs, and tools. Azure Cosmos DB for MongoDB RU is built on top of the Cosmos DB platform, taking advantage of its global distribution, elastic scale, and enterprise-grade security.
+Azure Cosmos DB for MongoDB RU (Request Unit architecture) makes it easy to use Azure Cosmos DB as if it were a MongoDB database. You can use your existing MongoDB skills and continue to use your favorite MongoDB drivers, SDKs, and tools. Azure Cosmos DB for MongoDB RU is built on top of the Cosmos DB platform. This service takes advantage of Azure Cosmos DB's global distribution, elastic scale, and enterprise-grade security.
 
 > [!VIDEO https://www.microsoft.com/videoplayer/embed/RWXr4T]
 
@@ -35,15 +35,15 @@ Cosmos DB for MongoDB RU has numerous benefits compared to other MongoDB service
 - **Five 9's of availability**: [99.999% availability](../../high-availability.md) is easily configurable to ensure your data is always there for you.
 
 - **Active-active database**: Unlike MongoDB Atlas, Cosmos DB for MongoDB RU supports active-active across multiple regions. Databases can span multiple regions, with no single point of failure for **writes and reads for the same data**. MongoDB Atlas global clusters only support active-passive deployments for writes for the same data.  
-- **Cost efficient, granular, unlimited scalability**: Sharded collections can scale to any size, unlike other MongoDB service offerings. The Azure Cosmos DB platform can scale in increments as small as 1/100th of a VM due to its architecture. This means that you can scale your database to the exact size you need, without paying for unused resources.
+- **Cost efficient, granular, unlimited scalability**: Sharded collections can scale to any size, unlike other MongoDB service offerings. The Azure Cosmos DB platform can scale in increments as small as 1/100th of a VM due to its architecture. This support means that you can scale your database to the exact size you need, without paying for unused resources.
 
 - **Real time analytics (HTAP) at any scale**: Run analytics workloads against your transactional MongoDB data in real time with no effect on your database. This analysis is fast and inexpensive, due to the cloud native analytical columnar store being utilized, with no ETL pipelines. Easily create Power BI dashboards, integrate with Azure Machine Learning and Azure AI services, and bring all of your data from your MongoDB workloads into a single data warehousing solution. Learn more about the [Azure Synapse Link](../../synapse-link.md).
 
 - **Serverless deployments**: Cosmos DB for MongoDB RU offers a [serverless capacity mode](../../serverless.md). With [Serverless](../../serverless.md), you're only charged per operation, and don't pay for the database when you don't use it.
 
 - **Free Tier**: With Azure Cosmos DB free tier, you get the first 1000 RU/s and 25 GB of storage in your account for free forever, applied at the account level. Free tier accounts are automatically [sandboxed](../../limit-total-account-throughput.md) so you never pay for usage.
 
-- **Free 7 day Continuous Backups**: Azure Cosmos DB for MongoDB RU offers free 7 day continuous backups for any amount of data. This means that you can restore your database to any point in time within the last 7 days.
+- **Free 7 day Continuous Backups**: Azure Cosmos DB for MongoDB RU offers free seven day continuous backups for any amount of data. This retention means that you can restore your database to any point in time within the last seven days.
 
 - **Upgrades take seconds**: All API versions are contained within one codebase, making version changes as simple as [flipping a switch](upgrade-version.md), with zero downtime.
 
@@ -62,7 +62,7 @@ Cosmos DB for MongoDB RU implements the wire protocol for MongoDB. This implemen
 
 All versions run on the same codebase, making upgrades a simple task that can be completed in seconds with zero downtime. Azure Cosmos DB simply flips a few feature flags to go from one version to another.  The feature flags also enable continued support for old API versions such as 4.0 and 3.6. You can choose the server version that works best for you.
 
-Not sure if your workload is ready? Leverage the automatic [pre-migration assessmant](pre-migration-steps.md) to determine if you're ready to migrate to Cosmos DB for MongoDB RU or vCore.
+Not sure if your workload is ready? Use the automatic [premigration assessment](pre-migration-steps.md) to determine if you're ready to migrate to Cosmos DB for MongoDB RU or vCore.
 
 ## What you need to know to get started