docs: fix duplicated words in documentation (#481)

- Remove duplicate 'for' in usingsubcircuits.md caption
- Remove duplicate 'different' in menubar.md

Author: akshitvigg

docs/chapter3/menubar.md

@@ -234,7 +234,7 @@ Table 3.5: Brief description of different selections available in the **Tools**
 
 ## Combinational Analysis Tool
 
-The Combinational Analysis tool available within the CircuitVerse simulator generates a circuit using combinational analysis or a boolean function (refer Figure 3.7). A truth table is then populated to construct the final circuit using different different gates and circuit elements.
+The Combinational Analysis tool available within the CircuitVerse simulator generates a circuit using combinational analysis or a boolean function (refer Figure 3.7). A truth table is then populated to construct the final circuit using different gates and circuit elements.
 
 > NOTE: If the user generates the circuit by entering a boolean function, then the truth table is auto populated else the user must manually set the values.
 

docs/chapter5/usingsubcircuits.md

@@ -14,7 +14,7 @@ For a hierarchical design flow, different circuit tabs can be inserted as a subc
 
 <div align="center">
   <em>
-    Figure 5.1: Ideal circuit design flow for for an integrated effort while
+    Figure 5.1: Ideal circuit design flow for an integrated effort while
     using subcircuits within CircuitVerse
   </em>
 </div>