update READMEs

exercises/bob/README.md

 
 He answers 'Whoa, chill out!' if you yell at him.
 
+He answers 'Calm down, I know what I'm doing!' if you yell a question at him.
+
 He says 'Fine. Be that way!' if you address him without actually saying
 anything.
 

exercises/parallel-letter-frequency/README.md

 
 As a stretch goal, consider if your implementation will work for characters with [diacritics or accents](https://en.wikipedia.org/wiki/Diacritic). For example, such solutions should not consider e and ë the same character. An example text for this case is [Wilhelmus](https://en.wikipedia.org/wiki/Wilhelmus), the Dutch national anthem.
 
+
 # Running the tests
 
 You can run all the tests for an exercise by entering

exercises/proverb/README.md

-# Proverb in Java
+# Proverb
 
-For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Dynamically output the full test of this proverbial rhyme.
+For want of a horseshoe nail, a kingdom was lost, or so the saying goes.
 
-> For want of a nail the shoe was lost.<br>
-> For want of a shoe the horse was lost.<br>
-> For want of a horse the rider was lost.<br>
-> For want of a rider the message was lost.<br>
-> For want of a message the battle was lost.<br>
-> For want of a battle the kingdom was lost.<br>
-> And all for the want of a horseshoe nail.<br>
+Given a list of inputs, generate the relevant proverb. For example, given the list `["nail", "shoe", "horse", "rider", "message", "battle", "kingdom"]`, you will output the full text of this proverbial rhyme:
+
+```text
+For want of a nail the shoe was lost.
+For want of a shoe the horse was lost.
+For want of a horse the rider was lost.
+For want of a rider the message was lost.
+For want of a message the battle was lost.
+For want of a battle the kingdom was lost.
+And all for the want of a nail.
+```
+
+Note that the list of inputs may vary; your solution should be able to handle lists of arbitrary length and content. No line of the output text should be a static, unchanging string; all should vary according to the input given.
 
 # Running the tests
 
 
 ## Source
 
-Wikipedia [https://en.wikipedia.org/wiki/For_Want_of_a_Nail](https://en.wikipedia.org/wiki/For_Want_of_a_Nail)
+Wikipedia [http://en.wikipedia.org/wiki/For_Want_of_a_Nail](http://en.wikipedia.org/wiki/For_Want_of_a_Nail)
 
 ## Submitting Incomplete Solutions
 

exercises/rail-fence-cipher/README.md

 
 If you now read along the zig-zag shape you can read the original message.
 
+# Running the tests
 
-
-To run the tests:
+You can run all the tests for an exercise by entering
 
 ```sh
 $ gradle test
 ```
 
-For more detailed info about the Java track see the [help page](http://exercism.io/languages/java).
-
+in your terminal.
 
 ## Source
 
-[Wikipedia](https://en.wikipedia.org/wiki/Transposition_cipher#Rail_Fence_cipher)
+Wikipedia [https://en.wikipedia.org/wiki/Transposition_cipher#Rail_Fence_cipher](https://en.wikipedia.org/wiki/Transposition_cipher#Rail_Fence_cipher)
 
 ## Submitting Incomplete Solutions
+
 It's possible to submit an incomplete solution so you can see how others have completed the exercise.
-i

exercises/two-fer/README.md

 
 ## Source
 
-This is an exercise to introduce users to basic programming constructs, just after hello World. [https://en.wikipedia.org/wiki/Two-fer](https://en.wikipedia.org/wiki/Two-fer)
+This is an exercise to introduce users to basic programming constructs, just after Hello World. [https://en.wikipedia.org/wiki/Two-fer](https://en.wikipedia.org/wiki/Two-fer)
 
 ## Submitting Incomplete Solutions