Preparation of the release 2.21.0: updated screenshots

Author: mkulesh

doc/html/functions_overview.html

@@ -318,8 +318,8 @@ <h4>6 Functions for real numbers</h4>
 argument</p>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
-  <td>$$random \left( 1\right)  = 0.0953165$$</td>
-  <td>$$random \left( 10\right)  = 4.76686$$</td>
+  <td>$$random \left( 1\right)  = 0.892466$$</td>
+  <td>$$random \left( 10\right)  = 1.85538$$</td>
 </tr></table><br>
 
 <p>The most negative (closest to negative
@@ -504,11 +504,11 @@ <h4>12 Arrays</h4>
   <td>$$n := \left[ 1,\, 2 \,..\, N \right]$$</td>
 </tr></table><br>
 
-<p>Define 1-D array</p>
+<p>Define 1-D array (enter "[")</p>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
-  <td>$$z[n] := x1 + \frac{x2 - x1}{N - 1} \cdot  \left( n - 1\right) $$</td>
-  <td>$$G[n] := f \left( z_{n} \right) $$</td>
+  <td>$$z_{n}  := x1 + \frac{x2 - x1}{N - 1} \cdot  \left( n - 1\right) $$</td>
+  <td>$$G_{n}  := f \left( z_{n} \right) $$</td>
 </tr></table><br>
 
 <p>Show elements of 1-D array</p>
@@ -521,10 +521,10 @@ <h4>12 Arrays</h4>
 <p>Assign value by index</p>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
-  <td>$$z[5] := -10$$</td>
+  <td>$$z_{5}  := -10$$</td>
 </tr></table><br>
 
-<p>Show values of single elements of array ("[")</p>
+<p>Show values of single elements of array </p>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
   <td>$$z_{5}  = -10.0$$</td>
@@ -539,7 +539,7 @@ <h4>12 Arrays</h4>
 </tr></table><br>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
-  <td>$$G2[n,m] := round \left( sin \left( 2 \cdot pi \cdot \frac{n + m}{N + M}\right) ,\, 3\right) $$</td>
+  <td>$$G2_{n,\, m}  := round \left( sin \left( 2 \cdot pi \cdot \frac{n + m}{N + M}\right) ,\, 3\right) $$</td>
 </tr></table><br>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>