Fix a few spots where inconsistently tabs and spaces are used for alignment.

java.html.markdown

@@ -186,9 +186,9 @@ public class LearnJava {
         //               operations perform as could be expected for a
         //               doubly-linked list.
         // Maps - A set of objects that map keys to values. Map is
-	//        an interface and therefore cannot be instantiated.
-	//        The type of keys and values contained in a Map must
-	//        be specified upon instantiation of the implementing
+        //        an interface and therefore cannot be instantiated.
+        //        The type of keys and values contained in a Map must
+        //        be specified upon instantiation of the implementing
         //        class. Each key may map to only one corresponding value,
         //        and each key may appear only once (no duplicates).
         // HashMaps - This class uses a hashtable to implement the Map

matlab.html.markdown

@@ -262,7 +262,7 @@ pcolor(A) % Heat-map of matrix: plot as grid of rectangles, coloured by value
 contour(A) % Contour plot of matrix
 mesh(A) % Plot as a mesh surface
 
-h = figure	% Create new figure object, with handle h
+h = figure % Create new figure object, with handle h
 figure(h) % Makes the figure corresponding to handle h the current figure
 close(h) % close figure with handle h
 close all % close all open figure windows
@@ -460,7 +460,7 @@ length  % length of a vector
 sort    % sort in ascending order
 sum     % sum of elements
 prod    % product of elements
-mode	% modal value
+mode    % modal value
 median  % median value
 mean    % mean value
 std     % standard deviation