(speedbar-use-tool-tips-flag, speedbar-ignored-directory-regexp,

(speedbar-use-tool-tips-flag, speedbar-ignored-directory-regexp,
speedbar-file-unshown-regexp, speedbar-file-regexp, speedbar-message,
speedbar-item-info, speedbar-files-item-info,
speedbar-maybe-add-localized-support, speedbar-insert-files-at-point,
speedbar-dynamic-tags-function-list, speedbar-generic-list-positioned-group-p,
speedbar-insert-generic-list, speedbar-fetch-replacement-function,
speedbar-extract-one-symbol, speedbar-separator-face): Fix typos in docstrings.
(speedbar-stealthy-function-list, speedbar-verbosity-level)
(speedbar-supported-extension-expressions, speedbar-update-current-file)
(speedbar-add-indicator, speedbar-tag-expand): Reflow docstring.
(speedbar-use-imenu-flag, speedbar-ignored-directory-expressions)
(speedbar-directory-unshown-regexp, speedbar-handle-delete-frame)
(speedbar-show-info-under-mouse, speedbar-directory-buttons)
(speedbar-check-vc-this-line, speedbar-files-line-directory)
(speedbar-buffer-buttons, speedbar-buffer-buttons-temp)
(speedbar-buffers-line-directory, speedbar-recenter-to-top)
(speedbar-recenter): Doc fixes.
(speedbar-update-speed, speedbar-navigating-speed): Add obsolescence
declaration and remove redundant info in docstring.