[Rd] minor typos in help pages (PR#598)

[rnassar@duke.edu]

Dear R Team,

A few monor typos in help pages that I noticed. 

Thank you very much.

Rashid Nassar

1.
help(gl)
Examples:

     # First control, then treatment:
     gl(2,8, label=c("Ctnrl","Treat"))
                      ^^^^
I assume "Cntrl" is meant.                     

==========================================
2.
help(pmatch)

Details:

     The behaviour differs by the value of `duplicates.ok'. Consider
     ...
     behaviour for partial matching of character indices, for example
                            # looks like something is missing here  ^^^ 

# perhaps:                                     
 
    ... indices, for example.      #[i.e. the use for partial matching of
                            ^      # character indices is the example]
                            
# or:  

   ... indices, for example,  # and the actual example goes here but is 
left out 

# (I'm not sure which).
     
=========================================
3.
help(on.exit)

Description:

     `on.exit' records the expression given as its argument as needing
     to be executed when then current function exits (either naturally
                            ^ 
                         [the] 

========================================
4.
help(influence.measures)

References:
 
     Cook, R. D. and Weisber,g S. (1982) Residuals and Influence in
                           ^^^      
=========================================

--please do not edit the information below--

Version:
 platform = i586-pc-linux-gnu
 arch = i586
 os = linux-gnu
 system = i586, linux-gnu
 status = Patched
 major = 1
 minor = 1.0
 year = 2000
 month = July
 day = 1
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base


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