Improved documentation for the commands to be used in the test harness for A3Q2 (CS 246)

a3q2doc

### STRING CONCATENATION
s destination source1 source2  // +                              - [[ MUTATE ]] concatenate two sources
t destination source1 string   // +                              - [[ MUTATE ]] concatenate a source followed by a specified string

### FIND
/ source1 source2              // /                              - [[ PRINT ]] print number of times source2 appears in source1
% destination source1 source2  // %                              - [[ MUTATE ]] removes occurrences of source2 in source1

### MEMORY MANAGEMENT
f destination                  // default constructor            - [[ CREATE ]] create empty iString (basically, empty string)
n destination string           // iString(char*)                 - [[ CREATE ]] create an iString object with given string as contents
i destination source           // copy constructor               - [[ COPY ]] copy an existing iString object using the copy constructor
= destination source           // =                              - [[ COPY ]] copy an existing iString object using the assignment operator
e source                       // delete source/call destructor  - [[ DESTROY ]] cleans up memory (must be called whenever new iStrings are created)

### AUXILIARY
r destination string           // >>                             - [[ READ ]] read a string into an iString object
w source                       //                                - [[ PRINT ]] print the iString
l source                       //                                - [[ PRINT ]] print length of iString

For '=' maybe you could label it [[ ASSIGNMENT ]] instead of [[ COPY ]]