maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.

--- a/scripts/gui/uiwait.m
+++ b/scripts/gui/uiwait.m
@@ -21,9 +21,9 @@
 ## @deftypefnx {Function File} {} uiwait (@var{h})
 ## @deftypefnx {Function File} {} uiwait (@var{h}, @var{timeout})
 ## Suspend program execution until the figure with handle @var{h} is
-## deleted or @code{uiresume} is called.  When no figure handle is specified,
-## this function uses the current figure.
+## deleted or @code{uiresume} is called.
 ##
+## When no figure handle is specified this function uses the current figure.
 ## If the figure handle is invalid or there is no current figure, this
 ## functions returns immediately.
 ##