Fix Latex syntax in Docs Examples

docs/src/examples.md

@@ -10,14 +10,15 @@ julia>p_binary_words_doub_runl(6,200) #e.g. 100000011010... or 01111110101...
 
 # Restricted summands problem
 
-Solve Polya partitions with restricted summands (denumerants) problem (Flajolet & Sedgewick, p.43). 
-For instance, what is the number of ways of giving change of 99 cents using pennies (1 cent), nickels (5 cents), dimes (10 cents) and quarters (25 cents). 
+Solving Polya partitions with restricted summands (denumerants) problem (Flajolet & Sedgewick, p.43). 
+What is the number of ways of giving change of 99 cents using pennies (1 cent), nickels (5 cents), dimes (10 cents) and quarters (25 cents)?
 
 That is, the number of ways to obtain 99 by summing 1s,5s,10s and 25s.   
+
 ``99 = k_1 1 + k_2 5 + k_3 10 + k_4 25 ``.  
 
-The generating function is:``P(z) = SEQ(z)*SEQ(z^5)*SEQ(z^10)*SEQ(z^25)`` and the solution is the
-cofficient of ``z^99`` in the expansion: ``[z^99] T(P(z))``.  
+The generating function is:``P(z) = SEQ(z)*SEQ(z^5)*SEQ(z^{10})*SEQ(z^{25})`` and the solution is the
+cofficient of ``z^{99}`` in the expansion: ``[z^{99}] T(P(z))``.  
 
 Function `restricted_sum_part_gf(r)` returns the generating function for elements in `r` and `restricted_sum_part(k,r)` returns the coefficient in ``z^k`` for the generating function with elements in `r`.