docs: make sure literal "->" isn't converted to arrow

Recent versions of asciidoc will treat "->" as a
single-glyph arrow symbol, unless it is inside a literal
code block. This is a problem if we are discussing literal
output and want to show the ASCII characters.

Our usage falls into three categories:

  1. Inside a code block. These can be left as-is.

  2. Discussing literal output or code, but inside a
     paragraph. This patch escapes these as "\->".

  3. Using the arrow as a symbolic element, such as "use the
     Edit->Account Settings menu". In this case, the
     arrow symbol is preferable, so we leave it as-is.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-cvsserver.txt

@@ -252,7 +252,7 @@ Configuring database backend
 
 'git-cvsserver' uses the Perl DBI module. Please also read
 its documentation if changing these variables, especially
-about `DBI->connect()`.
+about `DBI\->connect()`.
 
 gitcvs.dbname::
 	Database name. The exact meaning depends on the

Documentation/git-status.txt

@@ -94,12 +94,12 @@ In the short-format, the status of each path is shown as
 
 	XY PATH1 -> PATH2
 
-where `PATH1` is the path in the `HEAD`, and the ` -> PATH2` part is
+where `PATH1` is the path in the `HEAD`, and the ` \-> PATH2` part is
 shown only when `PATH1` corresponds to a different path in the
 index/worktree (i.e. the file is renamed). The 'XY' is a two-letter
 status code.
 
-The fields (including the `->`) are separated from each other by a
+The fields (including the `\->`) are separated from each other by a
 single space. If a filename contains whitespace or other nonprintable
 characters, that field will be quoted in the manner of a C string
 literal: surrounded by ASCII double quote (34) characters, and with
@@ -165,8 +165,8 @@ format, with a few exceptions:
 
 There is also an alternate -z format recommended for machine parsing. In
 that format, the status field is the same, but some other things
-change.  First, the '->' is omitted from rename entries and the field
-order is reversed (e.g 'from -> to' becomes 'to from'). Second, a NUL
+change.  First, the '\->' is omitted from rename entries and the field
+order is reversed (e.g 'from \-> to' becomes 'to from'). Second, a NUL
 (ASCII 0) follows each filename, replacing space as a field separator
 and the terminating newline (but a space still separates the status
 field from the first filename).  Third, filenames containing special