Update crud.md (#757)

* Update crud.md

fix insert sql syntax error

* Update tarball.md -- fix shell command tar syntax error 

fix shell command tar syntax error 
-f must close to file name

Author: pikachuSparkle

docs/crud.md

@@ -33,7 +33,7 @@ Populate the table with the sample data as follows:
 INSERT INTO customers (first_name, last_name, email)
 VALUES 
     ('John', 'Doe', '[email protected]'),  -- Insert a new row
-    ('Jane', 'Doe', '[email protected]');
+    ('Jane', 'Doe', '[email protected]'),  -- Insert another new row
     ('Alice', 'Smith', '[email protected]');
 ```
 
@@ -109,4 +109,4 @@ Congratulations! You have used basic create, read, update and delete (CRUD) oper
 
 ## Next steps
 
-[What's next?](whats-next.md){.md-button}
+[What's next?](whats-next.md){.md-button}

docs/tarball.md

@@ -83,7 +83,7 @@ The steps below install the tarballs for OpenSSL 3.x on x86_64 architecture. Use
 4. Extract the tarball to the directory for binaries that you created on step 1.
 
     ```{.bash data-prompt="$"}
-    $ sudo tar -xfv percona-postgresql-{{dockertag}}-ssl3-linux-x86_64.tar.gz -C /opt/pgdistro/
+    $ sudo tar -xvf percona-postgresql-{{dockertag}}-ssl3-linux-x86_64.tar.gz -C /opt/pgdistro/
     ```
 
 5. If you extracted the tarball in a directory other than `/opt`, copy `percona-python3`, `percona-tcl` and `percona-perl` to the `/opt` directory. This is required for the correct run of libraries that require those modules.