minor modifications and typo fixes in DVC tuto

README.md

 # testing Data Version Control (DVC)
 
+Doc: https://dvc.org/doc
+
 ## Install
 
 ```bash
@@ -45,7 +47,7 @@ To enable auto staging, run:
 	dvc config core.autostage true
 ```
 
-5. Record reference to data in git (but not datafile):
+5. Record reference to data in git (but not the data file itself):
 ```bash
 git add data/datafile.dat.dvc data/.gitignore
 git commit -m "data generation v1"
@@ -108,7 +110,7 @@ git commit -m "new version of generated data"
 dvc remote add -d local ../dvc-testing-remote
 ```
 
-Note: `-d` option is to set the new remote as the default one.
+**Note**: `-d` option is to set the new remote as the default one.
 
 9. Push to local DVC remote:
 ```bash
@@ -130,7 +132,7 @@ outs:
   path: datafile.dat
 ```
 
-Note: we can verify that the hash stored in the `data/datafile.dat.dvc` file corresponds to the actual `data/datafile.dat` file:
+**Note**: we can verify that the hash stored in the `data/datafile.dat.dvc` file corresponds to the actual `data/datafile.dat` file.
 ```bash
 md5sum data/datafile.dat
 ```
@@ -172,7 +174,7 @@ outs:
   path: datafile.dat
 ```
 
-Note: at this point, the datafile version does not correspond (discrepancy between the hash stored in the `data/datafile.dat.dvc` file and the actual `data/datafile.dat` file:
+**Note**: at this point, the actual data file version does not correspond to the version for this specific git commit (discrepancy between the hash stored in the `data/datafile.dat.dvc` file and the actual `data/datafile.dat` file.
 ```bash
 md5sum data/datafile.dat
 ```
@@ -181,25 +183,28 @@ md5sum data/datafile.dat
 a0c027223a771d1bb1519e5e5aaaf82c  data/datafile.dat
 ```
 
-
+3. Switch to corresponding version of data file with DVC:
 ```bash
-md5sum data/datafile.dat
+dvc checkout
 ```
 
 ```
-a0c027223a771d1bb1519e5e5aaaf82c  data/datafile.dat
+M       data/datafile.dat
 ```
 
-3. Switch to corresponding version of data file:
+4. Verify the version of the data file now corresponds to the git commit:
 ```bash
-dvc checkout
+cat data/datafile.dat.dvc
 ```
 
 ```
-M       data/datafile.dat
+outs:
+- md5: 8c0a82ed58e6152f9b134ba8d272dd42
+  size: 102400000
+  hash: md5
+  path: datafile.dat
 ```
 
-4. Verify that version of data file:
 ```bash
 md5sum data/datafile.dat
 ```
@@ -208,6 +213,11 @@ md5sum data/datafile.dat
 8c0a82ed58e6152f9b134ba8d272dd42  data/datafile.dat
 ```
 
+5. Switch back to last git commit:
+```bash
+git switch main
+dvc checkout
+```
 
 ## SSH remote
 
@@ -268,6 +278,5 @@ Disable [analytics](https://dvc.org/doc/user-guide/analytics) reporting (locally
 dvc config core.analytics false
 ```
 
-Note: add the `--global` option for global configuration as with `git`.
-```
+**Note**: add the `--global` option for global configuration as with `git`.