bpo-31873: Update unicode.rst - 'unicode' capitalization (GH-4125)

Update 'unicode' capitalization. 'Unicode' is a proper noun, and as such should be capitalized. 
Changed multiple instances.

Doc/c-api/unicode.rst

@@ -22,14 +22,14 @@ in the Unicode object.  The :c:type:`Py_UNICODE*` representation is deprecated
 and inefficient; it should be avoided in performance- or memory-sensitive
 situations.
 
-Due to the transition between the old APIs and the new APIs, unicode objects
+Due to the transition between the old APIs and the new APIs, Unicode objects
 can internally be in two states depending on how they were created:
 
-* "canonical" unicode objects are all objects created by a non-deprecated
-  unicode API.  They use the most efficient representation allowed by the
+* "canonical" Unicode objects are all objects created by a non-deprecated
+  Unicode API.  They use the most efficient representation allowed by the
   implementation.
 
-* "legacy" unicode objects have been created through one of the deprecated
+* "legacy" Unicode objects have been created through one of the deprecated
   APIs (typically :c:func:`PyUnicode_FromUnicode`) and only bear the
   :c:type:`Py_UNICODE*` representation; you will have to call
   :c:func:`PyUnicode_READY` on them before calling any other API.
@@ -152,7 +152,7 @@ access internal read-only data of Unicode objects:
 
 .. c:function:: void* PyUnicode_DATA(PyObject *o)
 
-   Return a void pointer to the raw unicode buffer.  *o* has to be a Unicode
+   Return a void pointer to the raw Unicode buffer.  *o* has to be a Unicode
    object in the "canonical" representation (not checked).
 
    .. versionadded:: 3.3
@@ -430,7 +430,7 @@ APIs:
 .. c:function:: PyObject* PyUnicode_FromFormat(const char *format, ...)
 
    Take a C :c:func:`printf`\ -style *format* string and a variable number of
-   arguments, calculate the size of the resulting Python unicode string and return
+   arguments, calculate the size of the resulting Python Unicode string and return
    a string with the values formatted into it.  The variable arguments must be C
    types and must correspond exactly to the format characters in the *format*
    ASCII-encoded string. The following format characters are allowed:
@@ -504,9 +504,9 @@ APIs:
    | :attr:`%A`        | PyObject\*          | The result of calling          |
    |                   |                     | :func:`ascii`.                 |
    +-------------------+---------------------+--------------------------------+
-   | :attr:`%U`        | PyObject\*          | A unicode object.              |
+   | :attr:`%U`        | PyObject\*          | A Unicode object.              |
    +-------------------+---------------------+--------------------------------+
-   | :attr:`%V`        | PyObject\*,         | A unicode object (which may be |
+   | :attr:`%V`        | PyObject\*,         | A Unicode object (which may be |
    |                   | const char\*        | *NULL*) and a null-terminated  |
    |                   |                     | C character array as a second  |
    |                   |                     | parameter (which will be used, |
@@ -1670,7 +1670,7 @@ They all return *NULL* or ``-1`` if an exception occurs.
 
 .. c:function:: int PyUnicode_CompareWithASCIIString(PyObject *uni, const char *string)
 
-   Compare a unicode object, *uni*, with *string* and return ``-1``, ``0``, ``1`` for less
+   Compare a Unicode object, *uni*, with *string* and return ``-1``, ``0``, ``1`` for less
    than, equal, and greater than, respectively. It is best to pass only
    ASCII-encoded strings, but the function interprets the input string as
    ISO-8859-1 if it contains non-ASCII characters.
@@ -1680,7 +1680,7 @@ They all return *NULL* or ``-1`` if an exception occurs.
 
 .. c:function:: PyObject* PyUnicode_RichCompare(PyObject *left,  PyObject *right,  int op)
 
-   Rich compare two unicode strings and return one of the following:
+   Rich compare two Unicode strings and return one of the following:
 
    * ``NULL`` in case an exception was raised
    * :const:`Py_True` or :const:`Py_False` for successful comparisons
@@ -1708,7 +1708,7 @@ They all return *NULL* or ``-1`` if an exception occurs.
 .. c:function:: void PyUnicode_InternInPlace(PyObject **string)
 
    Intern the argument *\*string* in place.  The argument must be the address of a
-   pointer variable pointing to a Python unicode string object.  If there is an
+   pointer variable pointing to a Python Unicode string object.  If there is an
    existing interned string that is the same as *\*string*, it sets *\*string* to
    it (decrementing the reference count of the old string object and incrementing
    the reference count of the interned string object), otherwise it leaves
@@ -1721,6 +1721,6 @@ They all return *NULL* or ``-1`` if an exception occurs.
 .. c:function:: PyObject* PyUnicode_InternFromString(const char *v)
 
    A combination of :c:func:`PyUnicode_FromString` and
-   :c:func:`PyUnicode_InternInPlace`, returning either a new unicode string
+   :c:func:`PyUnicode_InternInPlace`, returning either a new Unicode string
    object that has been interned, or a new ("owned") reference to an earlier
    interned string object with the same value.