[patch wfix] system_data_types.7: fix typo in regmatch_t description

[Michael Tokarev <mjt@xxxxxxxxxx>]

The description of rm_eo in regmatch_t structure has a typo
which makes it difficult to understand. Fix this.

Reported-By: Nicolás A. Ortega Froysa <nicolas@xxxxxxxxxxx>
Signed-off-By: Michael Tokarev <mjt@xxxxxxxxxx>

--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -1018,7 +1018,7 @@
 typedef struct {
     regoff_t    rm_so; /* Byte offset from start of string
                           to start of substring */
-    regoff_t    rm_eo; /* Byte offset from start of string of
+    regoff_t    rm_eo; /* Byte offset from start of string to
                           the first character after the end of
                           substring */
 } regmatch_t;