Update learn.mdx (#3256)

Updated to remove references to Gen3 and replace with the AnVIL Data Explorer.

docs/learn.mdx

@@ -52,18 +52,17 @@ This section covers:
 
 All you need is a Google account to register with Terra and browse AnVIL’s publicly accessible workspaces.
 
-Likewise, with a Google account, you can register with Gen3 and browse publicly accessible datasets or register with
+Likewise, with a Google account, you can register with the AnVIL Data Explorer and browse publicly accessible datasets or register with
 Dockstore and browse tools and workflows.
 
-To send artificial cohorts from Gen3 to Terra for Analysis, you will need to link your Gen3 and Terra accounts.
+To send artificial cohorts from  to Terra for Analysis, you will need to use the same Google ID for your Data Explorer and Terra accounts.
 
-To allow your dbGaP data request approvals to flow through to Terra and Gen3, you will need to link your eRA commons ID
+To allow your dbGaP data request approvals to flow through to Terra and the Data Explorer, you will need to link your eRA commons ID
 with both platforms.
 
 <Alert icon={false} severity="info">
-  For instructions on setting up accounts in Google, Terra, Gen3, and linking
-  them together see [Overview of Account
-  Setup](/learn/account-setup/overview-of-account-setup).
+  For instructions on setting up accounts in Google, Terra, the AnVIL Data Exlplorer, and linking
+  them together see [How to register in Terra on GCP (Google SSO)](https://support.terra.bio/hc/en-us/articles/360028235911-How-to-register-on-Terra-Google-SSO).
 </Alert>
 
 ### Obtaining Access to AnVIL Data
@@ -74,12 +73,12 @@ To obtain access to controlled-access data sets, you must either be a member of
 data-sharing agreement among consortium members or have been granted access to a study through the dbGaP Data Access
 Request process.
 
-Once you have been granted access, and assuming you have linked your eRA commons ID with Terra and Gen3, you will be
-able to see your new studies in Gen3 and new data-oriented workspaces in Terra.
+Once you have been granted access, and assuming you have linked your eRA commons ID with Terra, you will be
+able to see your new studies in the Data Explorer and new data-oriented workspaces in Terra.
 
 AnVIL’s open-access datasets such
 as [1000 Genomes High Coverage 2019](https://anvil.terra.bio/#workspaces/anvil-datastorage/1000G-high-coverage-2019) can
-be accessed in Terra or Gen3 immediately after account creation.
+be accessed in Terra or teh Data Explorer immediately after account creation.
 
 For a detailed listing of available datasets searchable by disease, data type, consent type, and consortia, see
 AnVIL’s [Dataset Catalog]({portalURL}/data/consortia).
@@ -111,7 +110,7 @@ analysis you require.
 There are several types of workspaces to consider when thinking about cloning a workspace to start your project.
 
 **Data-Oriented Workspaces** - These workspaces hold data for AnVIL open or controlled-access data sets or cohorts
-exported from Gen3. They may contain documentation in the dashboard about the study that generated the data set and data
+exported from the Data Explorer. They may contain documentation in the dashboard about the study that generated the data set and data
 tables holding sample and subject phenotypic metadata with links to the genomic data files.
 
 **Analysis Oriented Workspaces** - Analysis-oriented workspaces showcase a specific analysis or tool such