More copyediting of sequences.rst

I removed "they aren't suited for infinite sequences" since it seems like in fact they are, as given in some of the examples and the tests.

docs/contrib/sequences.rst

@@ -4,40 +4,40 @@ Lazy sequences
 
 .. versionadded:: 0.12.0
 
-The Sequences module contains few macros for declaring sequences that are
+The sequences module contains a few macros for declaring sequences that are
-evaluated only as much as the client code requests elements. Compared to
+evaluated only as much as the client code requires. Unlike generators, they
-generators, they allow accessing same the element multiple times. Since they
+allow accessing the same element multiple times. They cache calculated values,
-cache calculated values, they aren't suited for infinite sequences. However,
+and the implementation allows for recursive definition of sequences without
-the implementation allows for recursive definition of sequences, without
+resulting in recursive computation.
-resulting recursive computation.
 
-To use these macros, you need to require them and import other types like:
+To use these macros, you need to require them and import some other names like
+so:
 
 .. code-block:: hy
 
    (require [hy.contrib.sequences [defseq seq]])
    (import [hy.contrib.sequences [Sequence end-sequence]])
 
-The simplest sequence can be defined as ``(seq [n] n)``. This defines a
+The simplest sequence can be defined as ``(seq [n] n)``. This defines a sequence
-sequence that starts as ``[0 1 2 3 ...]`` and continues forever. In order to
+that starts as ``[0 1 2 3 ...]`` and continues forever. In order to define a
-define a finite sequence, ``end-sequence`` needs to be called to signal the end
+finite sequence, you need to call ``end-sequence`` to signal the end of the
-of the sequence:
+sequence:
 
 .. code-block:: hy
 
    (seq [n]
         "sequence of 5 integers"
         (cond [(< n 5) n]
-              [true (end-sequence)]))
+              [True (end-sequence)]))
 
-This creates following sequence: ``[0 1 2 3 4]``. For such a sequence, ``len``
+This creates the following sequence: ``[0 1 2 3 4]``. For such a sequence,
-returns the amount of items in the sequence and negative indexing is supported.
+``len`` returns the amount of items in the sequence and negative indexing is
-Because both of thse require evaluating the whole sequence, calling such a
+supported. Because both of these require evaluating the whole sequence, calling
-function would take forever (or at least until available memory has been
+one on an infinite sequence would take forever (or at least until available
-exhausted).
+memory has been exhausted).
 
-Sequences can be defined recursively. The canonical example of fibonacci numbers
+Sequences can be defined recursively. For example, the Fibonacci sequence could
-is defined as:
+be defined as:
 
 .. code-block:: hy
 
@@ -45,10 +45,10 @@ is defined as:
      "infinite sequence of fibonacci numbers"
      (cond [(= n 0) 0]
            [(= n 1) 1]
-           [true (+ (get fibonacci (- n 1))
+           [True (+ (get fibonacci (- n 1))
                     (get fibonacci (- n 2)))]))
 
-This results the sequence of ``[0 1 1 2 3 5 8 13 21 34 ...]``.
+This results in the sequence ``[0 1 1 2 3 5 8 13 21 34 ...]``.
 
 .. _seq:
 
@@ -75,6 +75,7 @@ end-sequence
 
 Usage: ``(seq [n] (if (< n 5) n (end-sequence)))``
 
-Signals end of a sequence when iterator reaches certain point of sequence.
+Signals the end of a sequence when an iterator reaches the given
-Internally this is done by raising ``IndexError``, catching that in iterator
+point of the sequence. Internally, this is done by raising
-and raising ``StopIteration``.
+``IndexError``, catching that in the iterator, and raising
+``StopIteration``.