[2.2.x] Fixed "byte string" typo in various docs and comments.

Backport of 881362986a from master

django/core/files/base.py

@@ -146,15 +146,15 @@ class ContentFile(File):
 
 
 def endswith_cr(line):
-    """Return True if line (a text or byte string) ends with '\r'."""
+    """Return True if line (a text or bytestring) ends with '\r'."""
     return line.endswith('\r' if isinstance(line, str) else b'\r')
 
 
 def endswith_lf(line):
-    """Return True if line (a text or byte string) ends with '\n'."""
+    """Return True if line (a text or bytestring) ends with '\n'."""
     return line.endswith('\n' if isinstance(line, str) else b'\n')
 
 
 def equals_lf(line):
-    """Return True if line (a text or byte string) equals '\n'."""
+    """Return True if line (a text or bytestring) equals '\n'."""
     return line == ('\n' if isinstance(line, str) else b'\n')

django/db/backends/postgresql/schema.py

@@ -22,7 +22,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
     sql_delete_procedure = 'DROP FUNCTION %(procedure)s(%(param_types)s)'
 
     def quote_value(self, value):
-        # getquoted() returns a quoted byte string of the adapted value.
+        # getquoted() returns a quoted bytestring of the adapted value.
         return psycopg2.extensions.adapt(value).getquoted().decode()
 
     def _field_indexes_sql(self, model, field):

django/utils/safestring.py

@@ -46,7 +46,7 @@ class SafeText(str, SafeData):
     """
     def __add__(self, rhs):
         """
-        Concatenating a safe string with another safe byte string or
+        Concatenating a safe string with another safe bytestring or
         safe string is safe. Otherwise, the result is no longer safe.
         """
         t = super().__add__(rhs)