Fix typo in README.markdown

README.markdown

@@ -102,9 +102,9 @@ an instance variable inside that class:
     pry(Hello):1> ls -i
     instance variables: @x
     pry(Hello):1> cd @x
-    pry(20:2)> self + 10
+    pry(20):2> self + 10
     => 30
-    pry(20:2)> cd ..
+    pry(20):2> cd ..
     pry(Hello):1> cd ..
     pry(main)> cd ..
 
@@ -112,7 +112,7 @@ The number after the `:` in the pry prompt indicates the nesting
 level. To display more information about nesting, use the `nesting`
 command. E.g
 
-    pry("friend":3)> nesting
+    pry("friend"):3> nesting
     Nesting status:
     0. main (Pry top level)
     1. Hello
@@ -123,7 +123,7 @@ command. E.g
 We can then jump back to any of the previous nesting levels by using
 the `jump-to` command:
 
-    pry("friend":3)> jump-to 1
+    pry("friend"):3> jump-to 1
     => 100
     pry(Hello):1>
 
@@ -224,7 +224,7 @@ In the following example we will enter the `Pry` class, list the
 instance methods beginning with 're' and display the source code for the `rep` method:
 
     pry(main)> cd Pry
-    pry(Pry)> ls -M --grep re
+    pry(Pry):1> ls -M --grep re
     Pry#methods: re  readline  refresh  rep  repl  repl_epilogue  repl_prologue  retrieve_line
     pry(Pry):1> show-method rep -l