fzblender.rst and gmtswitch: fix minor typos (#8636)

doc/rst/source/supplements/gsfml/fzblender.rst

@@ -177,7 +177,7 @@ coordinates for the left/right bounds along the FZ.
 Filtering
 ---------
 
-Filtering always runs of of data near the FZ end points.  We utilize :doc:`filter1d </filter1d>` with its
+Filtering always runs of data near the FZ end points.  We utilize :doc:`filter1d </filter1d>` with its
 **-E** option to extend the result to the end.  Because we are filtering data columns that may
 contain a strong trend (e.g., longitude versus along-track distance) we first remove such
 linear trends before filtering, then restore the trends before blending.  However, you should

src/gmtswitch

@@ -113,13 +113,13 @@ Before we can allow for switching you must prepare your environment.
 In your .cshrc or .tcshrc file:
 
 Change your path statement. Make sure it includes $home/this_gmt/bin
-If $home contains spaces places the the above within double quotes.
+If $home contains spaces places the above within double quotes.
 
 2. BASH USERS
 (re)Place these lines in your .profile file:
 
 Change your PATH statement. Make sure it includes $home/this_gmt/bin
-If $home contains spaces places the the above within double quotes.
+If $home contains spaces places the above within double quotes.
 
 3. GitHub USERS:
 You will have to manually add the path to the GMT directory since