Use consistent language for string termination (#806)

Avoid hyphen, prefer space: "null terminated"

modules/libcom/src/macLib/macLibREADME

@@ -36,7 +36,7 @@ c) long macGetValue ( MAC_HANDLE *handle, char *name,
                       char *value, long maxlen );
 
    Returns up to maxlen characters of the value of macro "name". "value"
-   will be zero-terminated if the length of the value is less than
+   will be null terminated if the length of the value is less than
    maxlen. The function value will be the number of characters copied to
    "value" (see below for behavior if the macro is undefined). If maxlen
    is zero, no characters will be copied to "value" (which can be NULL)
@@ -161,7 +161,7 @@ d) char *macEnvExpand( char *src );
    environment variables. It parses the string looking for such
    references and passes them to macGetValue() for translation. It uses
    malloc() to allocate space for the expanded string and returns a
-   pointer to this null-terminated string. It returns NULL if the source
+   pointer to this null terminated string. It returns NULL if the source
    string contains any undefined references.
 
 e) char *macDefExpand( char *src, MAC_HANDLE *macros );