lisp/progmodes/python.el: Fix docstring typos.

lisp/progmodes/python.el: Fix docstring typos.

(defconst, python-syntax-count-quotes)
(python-indent-region, python-indent-shift-right)
(python-indent-dedent-line-backspace, python-nav-backward-sexp)
(python-nav-backward-sexp-safe, python-nav-backward-up-list)
(python-shell-prompt-block-regexp, python-shell-prompt-output-regexp)
(python-shell-prompt-pdb-regexp, python-shell-enable-font-lock)
(inferior-python-mode, python-shell-make-comint, run-python-internal)
(python-shell-buffer-substring, python-shell-send-buffer)
(python-pdbtrack-activate, python-pdbtrack-stacktrace-info-regexp)
(python-completion-complete-at-point, python-fill-docstring-style)
(python-eldoc-function, python-imenu-format-item-label)
(python-imenu-format-parent-item-label)
(python-imenu-format-parent-item-jump-label)
(python-imenu--build-tree, python-imenu-create-index)
(python-imenu-create-flat-index): Fix docstring typos.
(python-indent-context, python-shell-prompt-regexp, run-python):
Remove superfluous backslashes.
(python-indent-line, python-nav-beginning-of-defun)
(python-shell-get-buffer, python-shell-get-process)
(python-info-current-defun, python-info-current-line-comment-p)
(python-info-current-line-empty-p, python-util-popn): Doc fixes.
(python-indent-post-self-insert-function, python-shell-send-file)
(python-shell-completion-get-completions)
(python-shell-completion-complete-or-indent)
(python-eldoc--get-doc-at-point): Reflow docstrings.