[lldb] Document ctrl-f for completing show-autosuggestion

[kastiglione]

Summary

Document how to complete command line suggestions provided by show-autosuggestion.

[teemperor]

I think fish shell (where I got that idea from) calls this "*accepting* a suggestion" which seems clearer than "completing a suggestion".

Otherwise this LGTM, thanks!

[kastiglione]

use "accepted" as the verb

lldb/source/Core/CoreProperties.td

def EscapeNonPrintables: Property<"escape-non-printables", "Boolean">,
     Desc<"If true, LLDB will automatically escape non-printable and escape characters when formatting strings.">;
   def FrameFormatUnique: Property<"frame-format-unique", "FormatEntity">,
     Global,
     DefaultStringValue<"frame #${frame.index}: ${ansi.fg.yellow}${frame.pc}${ansi.normal}{ ${module.file.basename}{`${function.name-without-args}{${frame.no-debug}${function.pc-offset}}}}{ at ${ansi.fg.cyan}${line.file.basename}${ansi.normal}:${ansi.fg.yellow}${line.number}${ansi.normal}{:${ansi.fg.yellow}${line.column}${ansi.normal}}}{${function.is-optimized} [opt]}{${frame.is-artificial} [artificial]}\\\\n">,
     Desc<"The default frame format string to use when displaying stack frameinformation for threads from thread backtrace unique.">;
   def ShowAutosuggestion: Property<"show-autosuggestion", "Boolean">,
     Global,
     DefaultFalse,
-    Desc<"If true, LLDB will show suggestions to complete the command the user typed.">;
+    Desc<"If true, LLDB will show suggestions to complete the command the user typed. Suggestions may be accepted using Ctrl-F.">;
 }