Fix grammar: correct articles (a->an) and verb tense in docs (#9597)

- Fix 'a entry' to 'an entry' in docs/terminal/basics.md
- Fix 'and selecting' to 'and select' in docs/terminal/basics.md
- Fix 'a item' to 'an item' in docs/python/tutorial-fastapi.md
- Fix 'a if' to 'an if' in docs/java/java-editing.md

Author: workwithbinu

docs/java/java-editing.md

@@ -189,7 +189,7 @@ The complete list of shortcuts is listed below:
 | for | for (T item : expr) | Creates a for statement |
 | fori | for (int i = 0; i < expr.length; i++) | Creates a for statement which iterates over an array |
 | forr | for (int i = expr.length-1; i >= 0; i--) | Creates a for statement which iterates over an array in reverse order |
-| if | if (expr) | Creates a if statement |
+| if | if (expr) | Creates an if statement |
 | nnull | if (expr != null) | Creates an if statement and checks if the expression does not resolve to null |
 | null | if (expr == null) | Creates an if statement which checks if expression resolves to null |
 | sysout | System.out.println(expr) | Sends the affected string to a System.out.println(..) call |

docs/python/tutorial-fastapi.md

@@ -190,7 +190,7 @@ Now we need a place to store the grocery list items. For simplicity, let's start
 3. Add the following route at the end of the `main.py` file:
 
     ```python
-    # Route to add a item
+    # Route to add an item
     @app.post("/items/{item_name}/{quantity}")
     def add_item(item_name: str, quantity: int):
         if quantity <= 0:

docs/terminal/basics.md

@@ -48,8 +48,8 @@ Icons may appear to the right of the terminal title on the tab label when a term
 
 Place multiple terminals side-by-side and create a group by splitting a terminal:
 
-* Hover over a entry in the list of terminals on the right and select the inline split button.
-* Right-click the context menu and selecting the **Split** menu option.
+* Hover over an entry in the list of terminals on the right and select the inline split button.
+* Right-click the context menu and select the **Split** menu option.
 * `kbstyle(Alt)` and click on a tab, the **+** button, or the single tab on the terminal panel.
 * Trigger the `kb(workbench.action.terminal.split)` command.