Help cleanup

Large list of changes, including formatting and typos for most commands.

More substantive changes have been made to alias, bind, block, break,
builtin, case, cd, commandline, count, else, emit, fish_config, funced,
function, functions, history, math, mimedb, nextd, not, popd, prevd,
pushd, pwd, random, read, set, set_color, switch, test, trap, type,
ulimit, umask, and while.

doc_src/fish_indent.txt

@@ -5,11 +5,11 @@
 
 \subsection fish_indent-description Description
 
-\c fish_indent is used to indent or otherwise prettify a piece of fish
+\c fish_indent is used to indent a piece of fish
 code. \c fish_indent reads commands from standard input and outputs
 them to standard output.
 
-\c fish_indent understands the following options:
+The following options are available:
 
 - <tt>-h</tt> or <tt>--help</tt> displays this help message and then exits
 - <tt>-i</tt> or <tt>--no-indent</tt> do not indent commands